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The Science Behind Streak-Free Windows: What Professionals Do Differently

When it comes to window cleaning, nothing beats the satisfaction of streak-free, crystal-clear glass. But achieving this pristine finish isn’t as simple as grabbing a cloth and some spray. Professional window cleaners have mastered the science behind streak-free windows, using specific techniques and tools to deliver flawless results. Here’s what they do differently and why their methods are so effective.

1. Using the Right Tools for the Job

Professionals don’t rely on standard cleaning products or paper towels to get the job done. Instead, they use high-quality tools specifically designed for window cleaning. Key items in their arsenal include:

  • Squeegees: The cornerstone of any professional’s toolkit, squeegees ensure even water removal, leaving no streaks behind. The rubber blades are replaced regularly to maintain their effectiveness.
  • Microfiber Cloths: Unlike traditional rags, microfiber cloths are lint-free and highly absorbent, making them perfect for detailing and edge cleaning.
  • Specialized Cleaning Solutions: Professionals often use eco-friendly, ammonia-free solutions that dissolve dirt and grease without leaving residues.
  • Water-Fed Poles: For high-rise or hard-to-reach windows, water-fed poles equipped with purified water systems are used to clean without streaking.

2. The Importance of Purified Water

One of the secrets to streak-free windows lies in the water itself. Tap water contains minerals, salts, and impurities that can leave behind spots and streaks when it dries. Professionals use purified water systems that remove these contaminants, ensuring a spotless finish.

Purified water also has a natural ability to dissolve dirt and grime more effectively than regular water. When combined with the right tools, it creates the perfect formula for crystal-clear windows.

3. Perfecting the Technique

The way professionals clean windows is just as important as the tools they use. Here are some techniques they employ to achieve streak-free results:

  • Pre-Cleaning: Before tackling the glass, professionals remove loose dirt and debris from the surface to prevent scratches.
  • Systematic Movements: Using a squeegee, they clean in overlapping strokes, starting at the top and working their way down. This ensures no spots are missed and prevents water from dripping onto already cleaned areas.
  • Edge Detailing: Professionals pay special attention to the edges and corners of the glass, where streaks are most likely to form. Microfiber cloths are often used for this step.
  • Drying Techniques: Any remaining water is carefully wiped away to prevent streaking. This step is crucial, especially in areas with high humidity.

4. Timing Matters

Professional window cleaners know that timing can make or break the outcome. Cleaning windows on a sunny day might seem like a good idea, but direct sunlight causes cleaning solutions to dry too quickly, leaving streaks behind. Professionals prefer overcast days or cooler parts of the day to ensure optimal results.

5. Safety First

For high-rise buildings or windows in hard-to-reach places, safety is a top priority. Professionals use specialized equipment like harnesses, ladders, and scaffolding to ensure they can clean effectively without compromising safety. This expertise allows them to tackle challenging jobs while maintaining streak-free quality.

6. Experience and Training

What truly sets professionals apart is their experience. Years of practice have honed their skills, allowing them to identify and address potential issues, like hard water stains or stubborn grime, before they become a problem. Their training ensures they can adapt to different types of glass and environments, delivering consistent results every time.

A Trusted Name in Toronto

When it comes to achieving streak-free windows, Toronto Window Cleaners has perfected the art. With over 20 years of experience, their team of fully trained and certified professionals uses advanced techniques and tools to deliver exceptional results. Whether it’s a residential property or a high-rise building, they’ve built a reputation for excellence across the Greater Toronto Area.

In conclusion, the science behind streak-free windows is a blend of using the right tools, employing expert techniques, and understanding the conditions that impact cleaning results. By trusting professionals, you’re not just ensuring sparkling windows—you’re investing in a methodical process that guarantees perfection every time.

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South Korean President’s Holocaust Remarks Spark Outcry From Israel, Controversy at Home

South Korean President Lee Jae Myung speaks during his new year press conference at the presidential Blue House in Seoul, South Korea, Wednesday, Jan. 21, 2026. Photo: Ahn Young-joon/Pool via REUTERS

South Korean President Lee Jae Myung has sparked a diplomatic row with Israel and criticism at home after comparing Israeli military actions against Palestinians to the Holocaust in a post on social media platform X.

The controversy began on Friday after Lee said “wartime killings” by the Israel Defense Forces were “no different from the Jewish massacre” by the Nazis in World War Two, and reposted footage with a caption that said it showed Israeli troops had tortured and thrown a Palestinian from the roof of a building.

Israel‘s Foreign Ministry said in a post on X on Saturday that Lee “for some strange reason, chose to dig up a story from 2024.” It said the incident occurred during an IDF operation against what it called “terrorists” and had been thoroughly investigated.

The ministry accused Lee, who had said that he needed to verify the footage, of the “trivialization of the massacre of Jews on the eve of Holocaust Remembrance Day in Israel,” saying his remarks were “unacceptable and warrant strong condemnation.”

Israel marks Yom HaShoah on Monday remembering the six million Jews murdered by the Nazis.

The Israeli military said in 2024 it was investigating the incident in the videos and described the actions as serious and not in keeping with its values.

Friday’s comments are a rare instance of Lee discussing international politics on social media and come as his government navigates a surge in energy prices following US and Israeli strikes against Iran. Tehran has closed the Strait of Hormuz to tanker traffic and South Korea is one of the world’s largest importers of oil and gas.

Lee did not mention the Iran war in his posts but said that South Koreans were today feeling “immense pain and national hardship.”

The president later on Saturday said it was “disappointing” that Israel criticized his comments and that it was natural to feel sorry if someone was suffering.

South Korea’s foreign ministry later said it was regrettable Israel “misunderstood” Lee’s remarks, which were about universal human rights.

Lee’s comments also proved controversial at home.

South Korea’s conservative party hit out at Lee for failing to speak more prudently and said he was showing double standards for his silence on human rights abuses in North Korea, while Lee’s Democratic Party praised him for speaking out on the universal value of human dignity.

The mainstream Joongang Ilbo newspaper said on Monday Lee would be well advised to recognize the weight of a president’s remarks and the risk of misunderstanding from unfiltered comments on social media, especially in sensitive global disputes.

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US Begins Blockade of Iran’s Ports, Tehran Threatens Retaliation

A billboard with a graphic design about the Strait of Hormuz on a building in Tehran, Iran, April 13, 2026. Photo: Majid Asgaripour/WANA (West Asia News Agency) via REUTERS

The US military began a blockade of ships leaving Iran’s ports on Monday, President Donald Trump said, and Tehran threatened to retaliate against its Gulf neighbors’ ports after weekend talks in Islamabad on ending the war broke down.

A US official said there was continued engagement with Iran, and forward motion on trying to get to an agreement. Pakistani Prime Minister Shehbaz Sharif also said efforts were still under way to resolve the conflict.

But oil prices climbed back over $100 per barrel, with no sign of a swift reopening of the Strait of Hormuz to ease the biggest ever disruption in supplies and broader concerns over the durability of a two-week ceasefire agreement reached last week.

Trump said Iran had been in touch on Monday and wanted to make a deal but that he would not sanction any agreement allowing Tehran to have a nuclear weapon.

“Iran will not have a nuclear weapon,” Trump told reporters at the White House. “We can’t let a country blackmail or extort the world.”

Since the United States and Israel began the war on Feb. 28, Iran effectively shut the Strait of Hormuz to all vessels except its own, saying passage would be permitted only under Iranian control and subject to a fee.

Trump has said Washington would block Iranian vessels and any ships that paid such tolls and that any Iranian “fast-attack” ships that went near the blockade would be eliminated.

Brigadier General Reza Talaei-Nik, a spokesperson for Iran’s Ministry of Defense, warned that foreign military efforts to police the strait would escalate the crisis and instability in global energy security.

NATO allies including Britain and France said they would not be drawn into the conflict by taking part in the blockade, stressing instead the need to reopen the waterway, through which about one-fifth of the world’s oil normally passes.

CEASEFIRE UNDER STRAIN

The ceasefire that halted six weeks of US and Israeli airstrikes looked in jeopardy, with only a week left to run. Washington said Tehran rejected its demands at weekend talks in Islamabad, the highest-level discussions between the two nations since Iran’s 1979 Islamic Revolution.

The US military’s Central Command said the blockade would be “enforced impartially against vessels of all nations” entering or leaving Iranian ports in the Gulf and Gulf of Oman.

“The blockade will not impede neutral transit passage through the Strait of Hormuz to or from non-Iranian destinations,” Central Command said in a note to seafarers seen by Reuters on Monday.

Two Iranian-linked tankers, the Aurora and New Future, left the strait laden with oil products on Monday before the deadline, according to LSEG data.

An Iranian military spokesperson called any US restrictions on international shipping “piracy,” warning that if Iranian ports were threatened, no port in the Gulf or Gulf of Oman would be secure. Any military vessels approaching the strait would violate the ceasefire, Iran’s Revolutionary Guards said.

Trump said Iran’s navy had been “completely obliterated” during the war, adding that only a small number of “fast-attack ships” remained.

“Warning: If any of these ships come anywhere close to our BLOCKADE, they will be immediately ELIMINATED, using the same system of kill that we use against the drug dealers on boats at Sea. It is quick and brutal,” Trump, much of whose communications are on social media, wrote on his Truth Social site.

He was apparently referring to the US strikes carried out against suspected drug boats in the Caribbean and Pacific. The strikes, which began in September, killed more than 160 people.

LEBANON FACES ATTACKS

Trump has also lashed out at US-born Pope Leo, who has spoken out against the war, denouncing him as “terrible” in a rare direct attack by a US president on a pontiff.

With rising energy prices causing political blowback, Trump paused the US-Israeli bombing campaign last week after threatening to destroy Iran’s “whole civilization” unless it reopened the strait.

Israel has continued to bombard Lebanon and on Monday Israeli troops launched an attack it said was intended to seize a key south Lebanon town from Iran-backed terrorist group Hezbollah. Israel and ‌the US have ⁠said the campaign against Hezbollah was not part of the ceasefire, while Iran has insisted it is.

Iran has brought new demands, including recognition of its control of the waterway, lifting of sanctions, and the withdrawal of forces from US military bases across the Middle East.

Trump has declared victory, despite so far not fully achieving the objectives he set out at the start of the war: to eliminate Iran’s ability to strike its neighbors, end its nuclear program, and make it easier for Iranians to topple their government.

Benchmark oil prices, which had eased last week after the ceasefire was announced, traded around 6% higher on Monday, off the day’s peaks but still above $100 a barrel.

Traders say the main benchmarks – used to set prices for trillions of dollars’ worth of commodities worldwide – actually understate the severity of a disruption with no precedent in modern times.

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For Another Year, BU’s Conference on Jewish Left Only Platforms Anti-Zionism

Peter Beinart, a prominent anti-Israel writer, being interviewed in January 2025. Photo: Screenshot

Academic conferences should foster inquiry, test ideas, and widen intellectual horizons. The third annual “Jewish Conference on the Left” held at Boston University (BU) last month was certainly presented in those terms. However, as time went on, it became clear that something else was afoot: Anti-Zionism framed as academic exploration, and a social structure encouraging the marginalization of Jewish students who fail to conform to their narrow and bigoted politics.

The gathering took place on BU’s main campus, reinforcing the perception that the conference’s ideology sits comfortably within the university’s academic culture.

The conference, which I attended, was dominated by anti-Zionist speakers, such as Peter Beinart, Fadi Quran, Dove Kent, and Arielle Angel. Beinart advocates for the dissolution of a Jewish-majority state, insisting Jews revert to once again existing as a vulnerable minority everywhere. Quran associates with the BDS movement. Kent’s org “Diaspora Alliance” rejects the IHRA Working Definition of Antisemitism definition. Angel is an ardent anti-Zionist. These are not neutral voices. They are activists representing an ideology that is effectively hostile to the idea of Jewish civil rights in our ancestral homeland. Several statements during the conference illustrated this bait and switch from policy debate to brazen indoctrination.

Numerous statements were made attacking Zionism and any Jews who believe in Israel’s right to exist. Neither the crowd, nor any other panelists, bothered to push back. Their only response was applause. It felt more like a political rally than a serious discussion on scholarship. 

Unsurprisingly, there were no pro-Zionist leftist perspectives, not even modest discussions about classic topics like two-state coexistence. There were no voices articulating how Jewish self-determination might co-exist with Palestinian statehood. There was only delegitimization, double standards, and dehumanization of Zionists and Israel masked by reasonable-sounding language and boilerplate euphemisms.

The organization fair held at BU only hosted radical left groups including Jewish Voices for Peace and IfNotNow. Tables included various infographics urging the IHRA definition be banned from schools, BDS graphics, comparisons between ICE and Nazi Germany, banning the ADL from schools, among others.

Clearly there was no room for dissenting views on the podium, and I observed the same mentality among its audience. At one point, I was berated by a stranger: “Shame on you for not clapping, you can’t even show respect for Fadi Quran.” 

While I did not overtly present myself as a Zionist, I also did not mask my beliefs. Throughout my many conversations, I was repeatedly quizzed about my personal and professional background, as if my fellow attendees were actively looking for a reason to dismiss my position. Suspicion was immediate and hovered over every conversation whenever I questioned the status quo. 

This is how ideological capture operates. It does not require formal censorship, all it needs is a couple of slogans and some bullies.

When a conference is promoted under the language of scholarly exploration to students and presents itself as an all-encompassing gathering of “Jewish left values,” the university’s association becomes part of the message. 

For students who identify as both Progressive and Zionist, events like these reinforce the idea that there is no place for them. Many already navigate campus environments in which Zionism is treated as morally suspect. Student government resolutions single out Israel. Activist rhetoric regularly distorts Zionism into a kind of racism or colonialism. Institutional repetition normalizes and enables these intellectual boundary-breakers. 

If Boston University intends to uphold its mission toward promoting intellectual diversity, it should clarify the distinction between providing space and conferring academic legitimacy. If organizers are truly acting in good faith, they should at least try to ensure that their conferences reflect the actual diversity within that tradition, or otherwise rebrand. 

After three consecutive years of hosting this conference, the issue is no longer whether individual speakers have the right to present their views. They do. The question is whether a major university should repeatedly platform a singular ideological current while presenting it as representative of a broader intellectual tradition.

Melody Kaye is a Boston-based Campus Advisor for CAMERA. 

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