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Unfortunately if your battery stain is white, it has penetrated too deeply into the concrete slab to bring back the color. Concentrated sulfuric battery acid has been known to eat through a 4" slab of concrete. Your best bet would be to cover it with a carpet or mat.

Puddleblocker makes an inexpensive Golf cart mat and has mats produced to go under vehicles too.

To keep the white stain from spreading (which it will!) you should neutralized it immediately. Here are some ways:

1) use TSP (Tri-sodium Phosphate) from a home improvement store- spray it on, agitate with a broom all over the stain and allow it to soak in. Then rinse it out with your garden hose.

2) Use any commercial grade degreaser in place of TSP. Any alkaline product will work.

Now, if your concrete stain is red, orange or brown... you have orange battery acid burn. The orange can also penetrate the concrete very deeply, up to 2" down into the cement. What we use, (and it works awesome!) is a product called F9 BARC. It is a battery acid restoration product made by front9restoration.com but is formulated for professional use. It's usually better to hire an F9 Authorized Professional Rust Removal Contractor than to try to tackle the restoration job on your own. The Professionals can get great results and use professional power washing equipment to aid in the restoration.

By the way, we have also used F9 Concrete Rust Remover on fertilizer stains, rust, irrigation stains and mud stains on walls... they all came out 95-100%.

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Q: How do you remove a white battery acid stain from concrete?
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I have over a decade of experience in specialized concrete restoration and here is your answer: 1. If your concrete is white, the sulfuric battery acid was extremely concentrated and has probably created a micro-aggregate or "etched" surface. The white you may (or may not see) is called an amorphous paste and is a by-product of the reaction between the acid and calcium silicate/lime/minerals in the concrete. You MAY be able to pressure wash the "white" out if it is not stained too badly. Chances are though, that the white staining will be permanent. I have seen concentrated battery acid work its way through an entire 4" slab of concrete. 2. If the stains are orange, dark orange or reddish brown or streak down your entire driveway you have battery acid "burn." Do not confuse "burn" with "rust". Although they look alike they are very different. Anything off the shelf that is a concrete "rust" remover will only remove a portion of the stain, create a white spot around the stain or may even turn the stain MORE orange. DO NOT USE HYDROCHLORIC ACID! I've seen many "Do-It-Yourself" answers that say to use HCL. This answer is straight up WRONG. Hydrochloric Acid, also known as "Muriatic" or "pool acid" will eat the top layer of cement. HCL will also turn the concrete white- but only because it has left a white residue in the cement. This is another example of "Amorphous Paste" and can easily be pressure washed out, revealing the orange acid burn again. HCL only removes a portion of the stain and it's because it's eating the top layer of cement! The stain you have goes much deeper than HCL can get to and you will expose yourself to serious harm if you get HCL on your skin or breathe in the vapors. F9 BARC is a Do-It-Yourself formula for Orange Battery Acid Stains that works! It's the "Ferrari" of concrete cleaners and also works 95-100% on just about every orange stain it touches- Fertilizer stains, rust, pool acid burn, battery acid stains and more. It's formulated to to a long way and very easy to apply with a pump sprayer.


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