IMHO, here's the issue......covert. tops are fabric that need to breathe....using most any "product" to protect against UV, etc. is going to obstruct or seal in dirt, contamination, etc....none of which is good for the top. IMHO, only use a good quality cleaner for routine maintenance..nothing more, nothing less and for real UV/IR protection, keep it covered.
Excellent advice, Beechkid.
Of the convertible tops I've owned, all were fabric; none was vinyl.
Without a garage, I kept them covered with NOAH covers to protect from UV and bird poop.
To avoid permanent creases, don't store your car with the top down for long periods.
I never put convertibles through automatic car washes.
For quick cleaning of dust and pollen after driving or lengthy parking, I use 3M lint rollers with excellent results.
If it's absolutely necessary to clean a top, I use diluted Simple Green. Rinse well and air dry.
I'm of the belief that top "Coatings" and "Treatments" are at best temporary, at worse a buildup of chemicals.