I just treated my top today for the first time. I couldn't find any 303 at autozone, so I used the only product they had "blue magic convertible top cleaner". It says it cleans and conditions. Yesterday while washing it, I sprayed concentrated soap on, scrubbed w/ the brush, then rinsed. Today I used the product. I guess it went ok, seeing as this was my first time ever doing this. Anyhow, my top is back to being blacker than black, and oddly, it seems as though lowering and raising the top is now easier. Dunno if the cleaner had anything to do with that.