I was given a bottle of Ultimate Red at a boatshow and just tried it on my inflatable
boat before stroring it for the winter. It is one of the few products I have used for boating
that performs as advertised. Spray it on, scrub lightly and hose off. My dingy is as clean as it was from the factory.
I have previously used a slew of other products including acetone with lesser results. Just be sure to wear gloves and use in a well ventilated space.