303 Tonneau and Convertible Top Cleaner is specially formulated for fabric and vinyl convertible tops and tonneau covers. 303 Tonneau and Convertible Top Cleaner utilizes a unique colloidal action to lift and suspend oil, grease and dirt. It does not contain soap, detergents, toxic organics, phosphates, nitrates or caustics. 303 Top Cleaner is extremely effective and extremely safe and leaves no residue like most cleaners. 303 Top Cleaner is extremely effective and extremely safe and leaves no residue like most cleaners. The 303 colloid cleaning products are completely people-safe. There are no effects from over exposure and no special storage requirements necessary. 303 colloid cleaners are non-hazardous, non-flammable, non-toxic, non-explosive, non-fuming, non-caustic and 99 percent biodegradable.