Starbrite Ultimate Xtreme Boat Cleaner Starbrites ULTIMATE Xtreme Clean is formulated with the latest technology ingredients to be the toughest crud-buster ever. The special chelating agents attack road grime, bug bits, bird deposits, greasy smears and more, breaking the bond that holds them to the surface so they can be wiped away without heavy scrubbing. However, unlike most all-surface cleaners that use cheap, harsh ingredients, Xtreme Clean does not contain caustic, dangerous chemicals that