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Unread 02-17-2020, 11:15 PM   #6
Tool Guy - Kg
Moderator -- Wisconsin Kitchen & Bath Remodeler
 
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Join Date: Feb 2005
Location: Oak Creek, WI
Posts: 21,841
Acids don’t clean. They eat. The product you used gave you some results by eating some of the grout away. But that’s not generally the answer.

I can’t see the condition of the grout right now to assess. But I’d suggest using a cleaner that works via breaking up the dirt. I suggest a high alkaline solution and use it just like you described. But I’m going to suggest you start with s single square foot as a test. Let it dwell for 5-7 minutes, agitate with a fine nylon bristle brush (better results than that mop/scrub thing in the picture) then wet vac that away. Rinse and vac again. And allow it to dry to assess the results. If you like it, keep going.

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