My Daughter purchased a 10 year old aluminum horse trailer that has never been cleaned or washed. I had read the reviews on the Bio-Kleen Step 1 acid wash and all seemed satisfied. I purchased a Gallon......The results were truly amazing...... it went from a oxidized grimy trailer, to new. I used 3/4 of a gallon on a 28 foot all aluminum enclosed horse trailer... I used a fertilizer sprayer and followed instructions.... work from the bottom up. AMAZING PRODUCT!!!

I work for a college and we had bleachers that had decades of wear. I used the acid wash on them and not only was it easy to use but it did an amazing job on lifting off all the grime.

Does not remove the hard stuck on stuff like gum, but if you get that off, spray this on and they turn shiny.

Bought this product refresh an aluminum flagpole which had been in some Alabama red clay for several years. Easy, easy, to use. Just like new. Left the aluminum perfectly shiny! Great product that's on the list of must haves!

Product works good , could do a little better on pitted or darker spots.Also breaking down pitch, treesap like pine, fir,spruce. Just conifers in general.