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While you need heat to peel back window film, the tint will often leave behind adhesive residue. You can use chemicals such as isopropyl alcohol or acetone to remove the residue, though hardware stores sell specialized solutions for this purpose as well. You can also use soapy water in a pinch!

Often, window film won’t stick if the glass is too dirty; dust and debris can prevent the adhesive from working. Make sure to clean the glass thoroughly before installing the window film. Low-quality film, which may have a weaker adhesive, might also be the cause of your window film’s inability to stick.

Some frosted glass sprays can handle the outdoors, but most of them aren't built for it. Sprays made for exterior use will say so clearly on the label. Anything marked “interior use only” can't hold up against rain, UV exposure, or changing temperatures without peeling, fading, or yellowing. Outdoor-rated sprays are typically more durable, but even then, proper prep and application matter. Before spraying anything outside, double-check the product instructions. If it doesn’t specifically mention exterior use, skip it. 

Most window installation and repair companies can handle putting tint film over your existing windows, but it’s best to hire a company that specializes in window tinting. This decision will result in the best application for the cleanest look, and it usually means you’ll get a better professional opinion about the type of tint and tint level that makes the most sense for your home and personal preferences.