WD-40 Original can repel moisture and stop condensation from building up on glass temporarily. However, it is a harsh solvent that can degrade the rubber seals and vinyl on modern windows. Instead of spraying WD-40, control indoor humidity or use safe, lasting alternatives like a silicone lubricant for hardware or a dehumidifier.
The best way to stop condensation on your windows is to manage indoor humidity by properly ventilating high-moisture areas, using a dehumidifier, and improving airflow across the glass. Condensation forms when warm, moist air meets the cold surface of your window and reaches its dew point.
Products such as WD-40 Original Spray for windows are specially formulated to absorb moisture from double panes of glass, and can easily be sprayed on both sides of the window to help remove condensation buildup.
Anti-condensation sprays leave an invisible, moisture-repelling barrier on glass. They keep water droplets from forming into larger, cloudy patches or pooling on sills. Highly rated options include Invisible Glass Anti-Fog Treatment and Rain-X Interior Glass Anti-Fog.
Salt is hygroscopic, meaning it naturally attracts and absorbs moisture from the air. When placed next to a cold window pane, it can help reduce the amount of water that collects overnight — particularly in small rooms or on single-glazed windows.
The most effective homemade moisture absorber is calcium chloride (or standard rock salt) paired with a simple two-bucket or hanging-sock setup. Because these salts are highly hygroscopic, they naturally pull water vapor directly out of the air.
While vinegar does have disinfecting and deodorising properties that can clean and remove built-up condensation from windows, it does not provide a long-term solution to stopping condensation. The root cause of condensation on windows is excess moisture in the warm air inside of your building hitting cold window panes.
Winter window condensation happens when warm, moist indoor air hits cold glass, causing the moisture to turn into water droplets. To stop it, you need to reduce your indoor humidity, keep the warm air circulating against the glass, and block drafts.
Anti-condensation spray is an invisible chemical treatment that prevents water vapor from forming tiny, light-scattering droplets on glass, plastic, and metal surfaces. It works by changing the surface tension of the material, causing moisture to spread out into an even, clear, streak-free sheet rather than fogging up.
Condensation happens because rooms get too cold, they fluctuate between cold and hot, and there is excessive moisture from cooking, washing and expiration. The biggest causes are showering, drying clothes on radiators and boiling pans.
While WD-40 is a great multipurpose solvent, it is a poor long-term lubricant and should never be used on items that require specialized lubricants, come into contact with food, or are made of sensitive plastics and rubber.
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Yes, but it depends entirely on why and how you are using it. WD-40 is not a traditional lubricant, so you must use it carefully depending on your goal.
If you already have condensation on your windows, here's how to remove it effectively: Wipe Windows Regularly: Use a clean, dry cloth or window squeegee to remove moisture from the glass. This is a temporary solution but can prevent further issues like mold or damage to window frames.
Keep your home adequately heated
Try to keep your home suitably heated. It usually helps to have a low background temperature of at least 15 degrees in all rooms. By doing this you are less likely to have condensation dampness as the warm air holds more moisture than cold.
Rice. Some people say that if you put rice on your window sill, it will reduce and prevent any condensation. How it is claimed to work: Since rice is hygroscopic (a.k.a. a material that absorbs moisture from the air), it's said to help with window condensation.
Improving your window insulation can make a big difference in reducing condensation. Double glazing helps keep the inner pane warmer by adding a sealed air gap between layers of glass. If replacing windows isn't an option, thermal window film is a cost-effective alternative.
Anti-fog solution for scuba masks
To make it up 500ml of anti fog, put 1/4 or 125ml of baby shampoo in the spray bottle (I usually use scales to measure it) and then fill the rest of the bottle up with water. Before going into the water, spray some anti fog into your mask.
Professional window cleaners rarely use blue spray cleaners (like Windex). Instead, they use a simple mix of clean water and a drop of pH-neutral dish soap (like Dawn) applied with a microfiber scrubber, then removed entirely using a sharp, rubber-bladed squeegee for a flawless, streak-free finish.
To stop winter window condensation, you need to lower your indoor humidity and keep the glass warmer. Aim for an indoor humidity level between 30% and 50%. Use exhaust fans when cooking or showering, open your blinds to allow warm air to reach the glass, and run a dehumidifier.
Condensation on the inside of your windows in the morning happens when warm, humid indoor air meets cold glass. It typically occurs overnight because outdoor temperatures drop and people release moisture into the air simply by breathing, which raises the humidity in tightly sealed, energy-efficient bedrooms.
Yes, opening your windows is one of the most effective ways to reduce damp and condensation in winter. By briefly exchanging the humid, stale air inside for the dry, crisp air outside, you lower the moisture levels in your home, which helps stop mold from forming.
How to Stop Condensation on Windows
Whether Windex or vinegar is "better" depends entirely on what is on your windows. Both are excellent, but they work through different chemical properties:
Hot water on cold windows is never a good idea since it will freeze more quickly. One-part slightly warm water to one part of vinegar is the perfect winter window cleaning mix. Adding a splash of windshield wiper fluid to your solution can stop it from freezing if you are working in very cold temperatures.