Shurhold Serious Marine Cleaner Shurhold Serious Marine Cleaner is a scientifically formulated multipurpose, multi-surface cleaner. Eliminate the need to use numerous cleaners Serious Marine Cleaner does it all! This powerful cleaner does not contain bleach and is safe for use on vinyl, non-skid, and graphics. This cleaner is perfect for a pre-wax cleaning. Features 32oz SMC comes in a ready to use trigger spray bottle. 1 gallon SMC Concentrate mixes with 4 gallons of water to make 5 gallons. 1