These drill brushes are a great product. I've been using them for over a month to clean grout left on tile. I used them with a chemical and after leaving the chemical on the tile for about 5 minutes these brushes easily sucked up the residue. The only downside to these brushes is the durability of the product. Used them with a drill at about 2500 rpm and it only lasted about 500-700 square feet before the bristle wear stayed at about 1/4 inch. I don't know if it was a combination of the chemical and abrasive nature of the job, but buying just 3 of them did 1900 square feet. All in all a great product and I would definitely recommend it as it has made my job a lot easier compared to manual cleaning.
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