[Jason in TX]

I think most people here are discussing the cleaning of dirty whites, not yellowed whites. I think you'll need the Bleeche White for yellowed tires.

I used the bleeche white once and it totally dried out and cracked my white walls on a '48 Plymouth I owned long ago.

I still sometimes use it, but I now immediately put a tire gloss on the cleaned white wall to keep the rubber moisturized.

Primarily though, just use a scrub pad and some dish washing soap, or stronger would be simple green.