How to Remove Grout from a Bathtub

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Jean asked: The tiles left fine traces of grout on the surface of my bath when I was tiling the wall next to the bath. How can I remove this? It has left marks in my bath which have discolored.

Grout is a strong adhesive and it can adhere to most any surface. Once it has set, it will be difficult to remove, but it can be done with some careful and persistent scraping.

You Will Need:

  • Razor, chisel, screwdriver (something with a strong, smooth edge that can be used for scraping)
  • Sulfumic or muratic acid
  • Water
  • Plastic scrubber

Steps to Remove the Grout:

  1. If the grout is fresh, it can be wiped with a sponge moistened with water. The water will soften the grout again allowing it to be wiped away.
  2. Once a day has passed, the grout will be cured and will no longer be removable with water. If this is the case, it will be necessary to scrape it away.
  3. Begin by carefully scraping the grout away with a flat, metal tool. Some other options are a margin rowel or painters tool.
  4. Hold it as flat as possible, no more than 45 degrees. Any steeper than that and you risk damaging the surface of the tub.
  5. Carefully scrape away at the grout until it is removed.
  6. If the grout is not coming off, it may require some chemicals to soften it.
  7. Apply a small amount of sulfumic or muratic acid using the guidelines on the package.
  8. Scrub with a plastic scrubber or continue to scrape with the metal scraper.
  9. When all of the grout is removed, clean the area thoroughly and allow to dry.

Additional Tips and Ideas

  • If the grout is too difficult to remove on your own, contact a professional and have it removed by them.
  • Sulfumic acid is not as harsh as muratic acid and should be tried first. Both are available from most home improvement stores.

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