Sadly my doorbell lens was peeling as well after about 4 years of having ring and paying monthly for service. Disappointing to say the least, but here’s what I did for a clearer picture. 1. Carefully peel off the remaining protective layer. 2. Clean base with rubbing alcohol to remove old adhesive. 3. Polish base with a light automotive polishing compound, clean of excess. 4. Polish base with automotive polish. Images are before and after. May need to repolish periodically.