Advice on aging storage door handles

Sounds like it is time for new handles/latches. The time to protect them would have been before the sun got to them. If it is any consolation, 303 gradually washes away and needs to be reapplied every few months. That is more maintenance than most of us will do or even remember.

I agree with above. I did however, buy two new handle latch assemblies several years ago, due to one not releasing easily. I was planning to also replace the one on the sun side (parked at home), due to fading. I put 303 on it instead, which made it look new, not white. I reapply 303 to decals a few times a year on sun side, and also to the slam latch handle assembly. Handle still looks like new, the decals not so much. I still carry the extra, new latch assembly, in case of need.

Jerry

If appearance is your only concern? Wipe them with black shoe polish.

A coat of primer, a coat of paint and then clear coat made all of my plastic look terrific And it last several years Craig