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I have used "Rust Aid," which can be found at any Home Depot, for rust stains and battery acid stains. Apply with a solvent resistant brush and let it air dry. It should remove and or bleach out the stain. It will whiten your concrete quite a bit too, but that will darken up after some time has passed. I had a significant stain, and now my driveway looks 100 times better.
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The concrete is etched. You can't really fix it. You may cover if with a topical sealer like an epoxy paint.
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Use some clumping kitty litter to be sure all the acid is soaked up (even if it looks dry) and then get rid of it with a shovel (not hands.) Use a powerwasher (good one) even if you have to rent it and if you rent it ask them what solutions they have that could get rid of this. Powerwashers are a God-send!
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The concrete is etched, if you really want it to be gone, you should rent a machine called a "shot blaster" or "Bead blaster." run it over the affected area a couple of times an the contamination will be gone. Wash the area well with water and baking soda. Seal the concrete once it is free of surface moisture.
First answer by Krpm. Last edit by Laneoh43. Contributor trust: 32 [recommend contributor]. Question popularity: 64 [recommend question]
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