303 Multi-Surface Cleaner - Marine 303 Multi-Surface Marine Cleaner is the only cleaner youll need to thoroughly clean your boat from bow to stern. This cleaner is safe for use on all types of upholstery and vinyl, delivering robust cleaning agents designed to counteract the damaging conditions of sea and sand. Soaked-in stains will disappear within minutes and discolored surfaces come back to life. 303 Multi-Surface Cleaner is safe for use on fabrics, stainless steel, chrome, vinyl, rubber, alu