Removing concrete stains

I have a bunch of tool boxes used by masons, which have some concrete
stuck on them.
I want to remove that stuff quickly and efficiently and it is a lot of
items (four huge Knaack field stations, Knaack gangboxes and many
concrete saws).
What is the best and easiest way/chemical etc thanks
I tried a power washer, it seems to work on some stains and,
miraculously, not on others.
i
Reply to
Ignoramus11693
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Sand blasting ?
Reply to
PrecisionmachinisT
Vinegar or just about any weak acid . How about that stuff they sell at the BigBox stores for cleaning mortar residue off new brickwork ?
Reply to
Snag
"Snag" fired this volley in news:Ltu8r.142$ snipped-for-privacy@newsfe12.iad:
Concrete is mostly sulfates, which don't dissolve easily in things that won't adversely affect the boxes.
If the "stains" are mortar, they'll come loose with a mild acid. If they're really Portland-based concrete, mechanical abrasion with water is the quickest way.
Lloyd
Reply to
Lloyd E. Sponenburgh
For the gangboxes, I would try whacking them with a piece of wood, or using a piece of wood like a chisel.
Reply to
ATP
When my chimney was built the stone mason used muriatic acid to wash the mortar stains off of the stones. I think he diluted it but I don't know how much. Anyway, the stones were all stained with mortar and after he washed them with acid they were all very clean. Muriatic acid will not damage the steel but will remove rust. Of course using any acid will require good rinsing afterwards to avoid rusting. Eric
Reply to
etpm
Common muriatic acid sold in gallons is 32%, or 20 degrees baume. It should be diluted 1:10 with water (3.2% solution). And use an alkaline neutralizer (baking soda and water, etc.) to keep it from continuing to etch the crete after you're done. Acid residue keeps finishes from sticking, too.
-- Stay centered by accepting whatever you are doing. This is the ultimate. -- Chuang-tzu
Reply to
Larry Jaques

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