While shopping at Academy the other day, I noticed an aluminum hull cleaner. I was going to buy JJV's Best on Amazon that evening, but this stuff was cheaper. I only bought 1 bottle, to try on the back of the boat. After doing the back, and seeing the difference, we went back from the carwash,and bought 2 more bottles, and used both on the sides. I probably over did it, but wanted it clean, with no streaks. It is $9.99 for a 32oz bottle. I used my spray handle out of a bottle i had. it screwed right on. It says to mix it 50/50, but the guys i talked to, said for heavy lime like mine, to use it out of the bottle.. The boat looks really good in person now.