I use Greased Lightning on almost everything onthe boat and it works great. Just make sure you rinse it well. I actually bought the stuff thinking it was a joke but then I actuaully used on a spot I missed after I had already cleaned my boat with other stuff and the spot was noticably cleaner than the rest of the boat.

I rewashed the boat with the greased lighting and was completly amazed at what the other stuff left behind.