I have read other links on here but am still not sure. I have a 17 ft painted aluminum white boat hull that has a moderate brownish/green water line on it. I want to clean it off and then wax the hull to get it looking good again. I have seen reference to Simple Green on here or CLR toilet cleaner. My question is...which is better and with Simple Green which one of their products do you use...the aluminum siding cleaner with a power washer or something else. Thank you in advance for your help.