It can be hard to pull off the non-slip bathroom stickers without ruining your bathtub’s finish or surface. The trick? Don’t scrape them off. Instead, use your fingernail or a plastic credit card to lift the corners of the sticker. Then spray a laundry pre-treatment product all over the sticker. Leave it, drenched, for several hours. Then, peel it off. Remove any stubborn glue residue with laundry spray.