Just what I needed for my pontoons.
I use a garden sprayer and cut this 3 parts water to 1 part acid.  Spray or on from bottom to top in manageable sections and watch it work for 3-5 minutes.<br /><br />Cutting from full strength keeps from having a lot of streaks, and gives me enough to go over my pontoons 2 times per gallon.<br /><br />Note: it is acid, and fairly strong.  It will burn your skin, and will slightly etch concrete, so be liberal with rinsing everything it touches.<br /><br />Will NOT shine your aluminum, but it will clean it without scrubbing and return it to light gray.  If you want to polish, that's a whole different process.
Rating: 5 stars