I know it's an old thread, but I have a white Warrior, and I've used Goof Off Professional Strength to really clean the white. Works great, although I wouldn't use it a lot, just to remove any stuff normal wash and wax can't get rid off.
The Goof Off is cheap, and found locally (Home Depot) I use it all the time to remove sticker residue, glue, etc. It's one of my favorite cleaners.
The Goof Off is cheap, and found locally (Home Depot) I use it all the time to remove sticker residue, glue, etc. It's one of my favorite cleaners.