On & Off is the best there is. I've been using it for over 15 years. My hull is white as well. It looks showroom new when I'm finished. 20 minutes start to finish on a 23 foot boat. As others have said, follow the directions. It's powerful stuff and will really do a number on your galvy trailer. Painted trailer (like mine) is no problem. Just wet the trailer first.
BT
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