Yes, and you should never use solvent on rubber. Even new rub rail looks dull grey. Rubber is resistant to abrasion. I scrub mine down with my deck washing brush with deck cleaner and flush in the grove to get rid of algae.I'm afraid to use a solvent.
Franklin, do you follow up with anything like armor-all?I've used acetone many times and it works great and doesn't seem to harm anything at all. Just get a roll of paper towels, soak in acetone and rub on. In 5 minutes you can do the whole boat and be done with it.
Now that sounds like the best method if you want "sparkle". Get the cleaner/wax combo.I just use a little wax. Cleans and polishes. Sparkles like new.