It’s the aluminum portion of the boat that is the worst. The top half of the boat which is the painted portion just needs soap and water. It’s just water lines from not being properly cleaned on the bottom half. I’ve seen some people use aluminum brightener on their aluminum boats. Since half of mine is painted I am worried that the acid in the brightener will hurt the painted portion of the boat. If I can figure out how to downsize the image of the boat I will upload it, but it says the file size is too large. Thank you for everyone’s help so far!