RELI premium boat shampoo RELI premium boat shampoo is a biodegradable boat wash that combines dense foam with powerful cleaning agents to produce a squeaky clean finish with total rinse ability. It will not harm any previously applied wax or sealant. It is excellent for use with most applications such as wash mitt, brush, foam cannon or pressure washer. It is highly concentrated use 1 to 2 ounces per gallon. It will leave your boat sparkling clean.