Bow To Stern (BTS Ultra-Clean Marine Cleaner Safe for all surfaces including vinyl and plastic Use full strength for tough jobs and dilute for smaller jobs Designed to compliment BTS Protectant BTS UltraClean is a powerful cleaning agent that is a blend of non-toxic, environmentally friendly cleaners. BTS is derived from naturally and is mild on the surfaces in your boat and you, but is tough on dirt, oil and grease and won't hurt our waterways. Spray on, let stand, wipe off and rinse.