How do I clean the grout on my slate floor entryway?

Betsy from NH
by Betsy from NH

I have a slate floor entryway to my house which gets a lot of foot traffic. The grey grout gets quite dirty and is difficult to keep clean. I've tried Bonami and Spic n Span, using old toothbrushes and a lot of elbow grease, but have had no success. Any suggestions?

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