Re: Battery Acid stains
Most strong acids like battery acid will actually discolor (or “burn”) the concrete when not neutralized within a short time of the spill. These sorts of stains tend to look like brown-orange, puddle-shaped areas on the driveway. The stain is often quite deep, and no products on the market today will satisfactorily remove this orange stain once it been on the cement for an extended amount of time. Too often, pressure washers are used to blast the surface clean when attempting to remove rust stains, which amounts to peeling off a deep layer of the concrete to expose a surface that is less stained. This is not doing the customer any favors they would probably prefer the rust stain!
found this in a book I had. Hope it helps
Willy
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