How do I clean a white substance on dark grout?

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  5 answers
  • You can try vinegar and a small brush (I use an old toothbrush) to clean it. If it's tile in the shower area, it's probably soap scum and vinegar works wonders on it.

  • Kelli L. Milligan Kelli L. Milligan on Jan 28, 2019

    It could be hard water deposits, you could try CLR if the vinegar doesnt work.

  • Leisa Yeager Leisa Yeager on Jan 29, 2019

    Baking soda and small brush Make a paste leave on then wash off

  • Chloe Crabtree Chloe Crabtree on Sep 04, 2021

    A solution of half water and half vinegar is also effective at cleaning both dark grout and white floor grout. Fill a spray bottle with the solution and apply directly to the grout. Give it a few seconds to penetrate the dirt and wipe clean with a damp cloth. Repeat as necessary.


  • Deb K Deb K on Sep 12, 2021

    Hi Cathy, I would try straight vinegar and a toothbrush, i's likely a calcium build up.