Battery acid on concrete

[Stateline P/W]

I have a customer that said her husband had cleaned his battery off with the water hose and it left a stain on the concrete. When I looked at it it looked like a rust stain. It's not a large stain, just where it puddled up and then a streak where it ran off the driveway. Would CLR work?? It appeared that just soap and pressure would work. Has anyone got any ideas????

Stateline Pressure Washing

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[Ken @ Pro-Coat]

Oxalic Acid powder mixed with warm water( careful of fumes and getting on skin or eyes) and brushed or pump sprayer applied let set for 15 mins. then flush with clean water, should work. Also CLR(a little pricey)should do the job.
The "rust look" stain sounds like radiator overflow from a vehicle parked there, though.

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[Mike Hughes]

Another option, if powerwashing doesnt work would be to just sealcoat the driveway (assuming it is asphalt).

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Mike Hughes
Everclear
Souderton, PA