How to Clean Grout and Install New Grout That Won't Stain


Grout is a major pain, especially when it's old and grimy. Today you'll learn how to clean grout and make it look new again. Plus we share which grouts to use if you decide to re-grout your bathroom floor or if you just installed new tile. The tips you'll learn will be priceless.
OxiClean is a great grout cleaning product. And yes, I get that this sounds like a cheesy commercial but this seriously works. Spray OxiClean Max Force onto a test area to make sure it won't ruin your grout or tile. If it doesn't, you can move forward and spray it on your grout.
Use a grout cleaning brush like this one to work the OxiClean into the grout. Let the OxiClean sit for 15-20 minutes on the grout. Then wipe it off with a clean sponge.
What if your grout is terrible? What's the the best way to remove it? Use an oscillating multi tool like this one and a grout removal accessory.
If you need to re-grout your bathtub or bathroom floor tile we recommend a few different grouts. This one is Mapei's Ultracolor Plus FA. It's a great option for both shower tile and bathroom floor tile. The smooth consistency and rapid setting allows for a quick installation.
Another grout we recommend is Mapei's Flexcolor CQ. It's pre-mixed, has color consistency, stain resistant, and super easy to use. Flexcolor CQ is rapid setting as well and allows you to install grout without any guesswork.
When you open a tub of Flexcolor CQ it's ready to be used.
Apply Flexcolor CQ to the joints at a 45 degree angle and remove any excess by moving a rubber grout float at a 90 degree angle to the tile.
Sponge off excess Flexcolor CQ with a sponge and water. Our video shares all the details.
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Have a question about this project?

3 of 17 questions
  • Judyann Affronti
    on Jan 22, 2018

    Why does my silicone grout (the seal between the wall and tub) turn black? I've tried everything: OxiClean, bleach, peroxide, and nothing bleaches out the stain. Haw can I solve this problem?
    • Jennifer Hughes
      on Sep 24, 2019

      because it weighs the tub down so when the caulk is put on its at its lowest point and if you dont do this then when u fill the tub with water for a bath, the weight of the water will pull the tub down and pull on the caulk and pull it away from wall/tub. look up a pick of a tub, the mold of the tub underneath is not solid, it will give & take when it goes from full to empty, and visa versa. ever stand in empty tub and gently jump up n down, try it, you'll be amazed at how u can feel it move

  • Bryan Armstrong
    on Jul 26, 2018

    When do you prefer the use of the Ultacolor or the Flexcolor? Other than the pre-mix vs. mix, is one better than the other for shower, bathroom wall and floor install? Neither requires a sealer correct?

    • Lisa House
      on Oct 6, 2018

      We learned the hard way that not all grout is the same. Around the tub you need to use a flexible grout. The tub gives when you step into it and that can cause the grout to crack which can allow moisture to get behind the tile, the next thing you know the tiles are falling off. Our installer didn't even know this, it took us 3 years of repairing and regrouting before Home Depot finally told us about this. We are finally done repairing the bottom 3 inches of tile around our tub!

  • Lisa Putty Hess
    on Feb 10, 2019

    Can you grout over existing grout with this stuff?? My tile around my garden tub needs to be redone . we don't really want to totally tear it all out and restart.

    • Lyn
      on Jul 31, 2019

      Garbage in, garbage out. If you do not tear it all out it will look terrible with the old and new and you will most likely have the same problem! Hope this helps!!

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