IMAR Multi-Purpose Marine Cleaner The IMAR Multi-purpose Marine Cleaner #501 will penetrate, emulsify and lift away multiple layers of grime, soil and mildew. It gives concentrated cleaning power for inflatables, vinyl tops and upholstery, power cords, fenders, cockpit decks and other tough jobs. It is a non-caustic heavy-duty cleaner that really works. (This product is packaged full strength. You may need to dilute cleaner before using.You may need to dilute cleaner before using. Test on a small surface and flush well with water after cleaning.)