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Old 03-03-2012, 07:40 PM   #1
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Join Date: Apr 2004
Location: Mid Hudson, NY
Posts: 97
grout discolored from "garbage"

A trash bag with some kitchen trash was left on a floor, by persons unknown, and "festered".

It leaked and left a "growth" that covered the (sealed) cementitious (?) grout.

Cleaned up, it has left the grout darker than the surrounding grout. Noticeable, but at least is does not stink.

But, how to clean it? I have scrubbed, soap and water, soaked in a mild bleach solution and tried hydrogen peroxide (well, why not ?).

Would muriatic acid be next?
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Old 03-03-2012, 11:08 PM   #2
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Location: Southern Florida
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Hi Joe

No, no, no! Don't even think about using muriatic acid. That stuff is for swimming pools! This is not to mention how dangerous it is to your organs, and indoor electronics, etc.

You need a degreaser not an acid to break up the stain. Acids will dissolve cementitious materials, such as grout. I've seen grout dissolved down to the thinset from its improper usage.

Since your grout is so porous, you'll need to make or use a poultice. You could first try several layers of folded paper towel (white non print) and lacquer thinner. Soak the paper towels (approx. 6-8 layers/folds) with lacquer thinner. Cover with plastic, and tape down the perimeter edges. Allow to sit overnight, remove the plastic and tape in the morning. Allow the paper towel to dry thoroughly (no peeking). Remove the paper towel after it's dry.

Report back with your results.
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