Solar panels have white film on them

I have 3 solar panels on 3 separate ring doorbells and all 3 have a white film on them. Almost looks like scotch tape with water and dirt stuck under the tape.

I scratched at a corner and it came off under my fingernail.

Anyone have an idea as to what this is and how to remove it without damaging the panel.

The panels are still charging though.

Thanks.