Join Date: Apr 2002
Location: Long Island NY
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An effective way to prevent more mildew from growing in your boat is to ensure adequate ventilation.
In a previous boat I added a louver to one of the companionway hatch boards and cut a hole in a forward opening hatch to accommodate a solar-powered Nicro ventilator, operating to blow air into the boat (these fans can be run either way).
It not only prevents mildew formation but also rides the boat of that nasty toilet smell you often encounter on first opening after several days' absence.