I’ll admit right away that I’m a big Windex girl. It’s cheap, readily available, and you can easily spray it on everything from mirrors (normal!) to tabletops (not normal!) for a quick clean. However, it turns out that you shouldn’t use the specialized glass cleaner on everything, because it can cause real damage to certain surfaces. Here’s what you really shouldn’t spray.

This is a surprise, but you can't use Windex on plexiglass, so if you have art framed in some kind of decor made from it, put the bottle away. According to Reader's Digest, some Windex products contain ammonia, which will ruin the material. You can use the ammonia-free version, but you'll want to make sure you have it. Get it here for around $4.

Reader's Digest also warns against using Windex on shower doors, of all things, if the doors are full of soap scum. Windex just doesn't break it down very well. The good news is that you can use plain old dish soap or a Mr. Clean Magic Eraser to remove the residue. Prevent residue by keeping a dish soap rod in the shower and using it to clean the inside every time you rinse. Once your shower doors are free of grime, you can use Windex, but you probably don't even have to.

Windex is no good for cleaning your TV screen (or any tech screen, for that matter). According to CNET, it can easily permanently damage the screen because modern TVs have special coatings that wear off with anything too strong. Dilute dish soap in water and use a microfiber cloth. Here’s our full guide to safely cleaning a TV, which doesn’t include Windex unless you have an old TV with a plain glass screen.