We recommend using any of the rust stain removers below on your hull/deck, but be careful, these chemicals can cause damage to your boat and your skin! Follow manufacturer instructions carefully. Remember, as little as possible and as much as necessary! You may want some 1" throw away brushes for this and you can cut them short with scissors so it doesnt fly everywhere. Then we like to finish it with some flitz or collinite's metal polish to make that baby shine.