Review on Dico Products 7200005 Nylox Cup Brush 21/2" 80 Grit, Grey by Mark Cai

I bought this hoping to remove excess grout from tile. However I also bought the orange and blue ones that are less abrasive. I started out using the blue, the least abrasive of the three but could immediately see that it was just slightly etching my tile! So it was useless for what I needed it for. However I think it would definitely have other uses.