F
Frazer Gould
I recently purchased some black floor tiles from Topps and have grouted them with a grey grout. The tiles are riven but also the surface is non-slip (matt finish). I could not see the problem as I worked but in a couple of awkward places I didn't remove all of the surplus grout (I thought I had but with using a damp cloth the tiny holes filled with grout were not easy to see). Now it has dried the small pin pricks of grout are visible. I have tried vigorous rubbing with a sponge, green pan scrubber and even a brass brush (started to leave brass on the surface so did not pursue that one!). Any ideas how I can remove this problem?