During a boat trip, I stored my sunglasses at the bottom of a bag, without a case, along with everything else. A spot of glue ended up on one of the lenses. I tried every gentle product I could think of : dish soap, alcohol wipes, but nothing worked. It was impossible to remove.

Yesterday, I forgot this pair of sunglasses in my car under the sun. They became very hot, and I noticed that the glue had started to bead. When I ran my finger over it, the glue came off easily.