How to get a rust stain out of concrete?

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A friend of mine pulled his golf cart onto our concrete apron and battery acid drained onto our concrete and made a rust stain in it. The concrete is only about a month old and it looks awful. Any suggestions on how to get this out?

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  1. Matthew says:
    August 6, 2009 at 5:26 am

    Things You’ll Need:
    Rubber gloves
    Boots
    Goggles
    Respirator for acidic vapors
    Fan for air movement
    5-gallon bucket of water
    Muriatic acid
    Plastic pan
    Measuring cup
    Plastic cover for floor
    Long handled floor brush.

    1. Follow directions carefully. Lay all materials on a plastic cover. Once you have your safety gear on, put two cups of water in the plastic pan and add 1/4 cup of muriatic acid to the water. Always pour acid into water and not the other way around.

    2. Apply a little acid solution at a time on the rust stain. Solution will bubble. Let it soak in and begin to work for about five minutes. Use the floor brush to scrub it in and reapply as needed. Remember the acid is removing a top layer of concrete.

    3. Use fresh water to rinse off and scrub the area clean. Make sure every trace of solution is gone. Do not get any of this solution on plants or they will die.

    4. Notice the look of the concrete. The cleaned area will be left slightly rougher than the rest but it does not hurt the floor. It will be comparable to light sandpaper.

    5. Once you have removed all stains and solution, let the floor dry. Rinse off your equipment and take a shower. To protect your floor from future damage or stains, seal it with a concrete sealant.

  2. Kung Fu Panda says:
    August 6, 2009 at 5:26 am

    clr or maybe you can water pressure it.clr probably isnt good for the environment

  3. repairman says:
    August 6, 2009 at 5:26 am

    Nothing you can do about it… their only way you needs to paint it.

  4. donnie m says:
    August 6, 2009 at 5:26 am

    pour bleach on it and let it stay on it for about 1 hr. then either hose it off or pressure wash it off would be better.

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