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I just redid a fair amount of a walkin shower grout. Bought a vibratory multitool for the corners etc but it was slow so ended up being very careful with a angle grinder and diamond tile blade. Took a couple hours to remove most of the grout in the bad areas-above waterline was ok- and clean up the dusty mess. Regrouted with Mapei (cycling content!) with a anti mildew additive in a matching color.
Once the grout is to the point where it is repeatedly staining, or failed, this is best solution.
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