Painters should prepare the room they paint with groundsheets and masking tape. Amongst other things the windows should be protected, so they do not suffer any paint accidents.
However, paint does occasionally get on windows. This is easy to clean off if the paint has not dried. Often it can be wiped away, perhaps with the aid of thinner for oil paint or water for water based paints. Occasionally paint will dry out on glass before it can be cleaned off. This is a nuisance, but it can be dealt with.
- Wet the window with warm soapy water. This will soften the paint. You may need to reapply the soapy water several times.
- Use a razor blade or paint scrapper to scrap off the paint. Angle the edge of the blade / scraper at 45 degrees to the window above the paint and scrape downwards.
a sharper edge works best here.
- If the paint comes off easily then clean the window with glass cleaner.
- For stubborn paint, try stronger solvents. Rubbing alcohol will work for acrylic paints. Acetone will remove enamel paint.
Make sure the area is well ventilated, and avoid inhaling these fumes.
Some people find that a hair drier will heat and soften paint so that it is easier to scrape off. But this heating method is not recommended for windows that have UV film; the heat can damage the film.