I have recently obtained a camera that has a lens that was apparently left in the sun/heat, and now the plastic on the lens is sticky. I was wondering if there was a way to make it not sticky without damaging it any more than it already is?
If it's older, and if it's not a substance (like soda) - then it could be either:
A chemical reaction with something like insect repellent(DEET) or sunscreen (??). Certain ingredients in these products can react with polymers and paint. I don't know if it's reversible.
OR, if it's old - it could be the polymers breaking down. Rubbery-type Polymers will also degrade over time (and with UV/heat exposure) and become tacky. I was told by my former Plastics professor, that this was a very bad thing (it's a carcinogen). Maybe look into getting those components replaced.