As a owner of several Convertibles and current owner of one. I have learned my lesson more ways than I can count. The best thing for the top is:
SOAP and WATER ( I only use this on my top and it is in MINT condition)
Everything else you put on it will give you all new problems. From fading the color, to cracking the top, and my favorite with basically any product you use, when it rains or water hits the roof, the product will run all over your car.
__________________
|