I was wondering if anybody had any tips for getting rid of a waterline stain. Mine is pretty bad being, that I spend a lot of time on the river, and I am wanting to clean up and sell my boat. It's a painted boat, so I didn't want to use anything that will eat the paint off. I've tried just soap and water with a scrub brush and it won't phase it. I've got some stains on the motor I'd like to get rid of too. Any ideas??