There are a few ways to remove mirror stickers from walls. The first way is to warm up the glue that's holding the sticker to the wall. This will cause the glue to liquefy and come away from the mirror easier. A hairdryer or a heat gun can be used to soften the glue so that you can easily peel the sticker off the wall. Be careful not to cut the adhesive as it can become clogged and ineffective. This method is also workable for removing wall decals.
Another way to remove the adhesive is to use a cleaning agent. This solution will remove the sticky residue that has been stuck to the wall. You may need to rub a dry cloth over the sticky area to remove the remaining adhesive. However, this method is safe for most types of adhesive. To apply this solution to the adhesive, use a clean, lint-free cloth and rub it gently over the area in a circular motion. The adhesive will ball up and come off easily.
To remove a sticky sticker or glue from the mirror, apply vegetable oil to the area. This is a safe starting point for any other type of adhesive. Simply take a clean lint-free cloth and wring it out. Apply the oil to the adhesive, using a circular motion. If the adhesive balls up and comes off easily, you're done! Now it's time to clean the mirror.