How do you clean colored sealed concrete?


I have a coloured sealed stamped patio area outside approx 8 months old. The bricks on the wall of the house I believe have created calcium deposits/efflorescence over the concrete, my question is how can I clean this off without damaging the Finnish of the concrete, I can;t find much info online about deposits created outside of the concrete sealing.

  4 answers
  • William William on Dec 26, 2018

    A 50/50 mix of vinegar and water should clean it off. Also use it on the brick wall then seal the wall with concrete sealer.

    • Shanice Ebony Orr Martin Shanice Ebony Orr Martin on Dec 26, 2018

      I have also done a test area of vinegar however it hasnt seems to lift very much. Maybe ill try a bigger area and scrub really will with a broom.

  • Shore grandmom Shore grandmom on Dec 26, 2018

    Since it's fairly new, contact the company that installed it and ask what the product they used recommends for cleaning it. That way, you won't void any warranty using the wrong products.

    • See 3 previous
    • Shore grandmom Shore grandmom on Dec 27, 2018

      You might have to reseal if the product that finally takes the stains off also takes off some of the original sealer. Resealing the concrete and sealing the wall will just give extra protection. It can't hurt. It could be time consuming depending on the area you have to cover but might save you time and aggravation in the long run. Good Luck.

  • William William on Dec 26, 2018

    I wouldn't try hydrochloric acid. Way to caustic. What you can try is muriatic acid in a small inconspicuous area. Does etch raw concrete but the stain and sealer may offer some protection.

    • Shanice Ebony Orr Martin Shanice Ebony Orr Martin on Dec 26, 2018

      Muriatic Acid is the same thing as Hydrochloric acid, at least in Australia it is, I guess there is no other alternatives and I will have to try my luck with the hydroclauric acid if the vinegar doesnt work again.

  • William William on Dec 26, 2018

    Yes muriatic acid is an industrial name for hydrocloric acid but has more impurities in it. Be careful in handling it.

    If you're just removing mineral deposits (efflorescence), use a much weaker mix (10:1 or 16:1 for muriatic acid).