When I had my boat I used On & Off - It was great - It took every thing off - Even those black rub marks - Back then it was an acid - The first time I used it I opened it up and smelled it - I almost passed out - Then I tried using a sponge - That lasted about 10 seconds before it just fell apart - Not sure if it still is - It burned holes in my shirts - The pictures are of me using it on Lloyd's V20