Although our grout hasn't been cleaned for a very long time, it did its job quite well. I sprayed it on the grout and then let it sit for 10-15 minutes before scrubbing. Unfortunately I had to repeat the process 2-3 times to get results and brightness almost as good as the original (on gray and cream grout). There are some areas where Clorox toilet cleaner + bleach must be used. Another downside is that Blue Diamond Cleaner is difficult to rinse off and wipe off.
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