Can existing dirty grout be re-grouted?
1. To merely apply new grout over existing grout is not the answer because it will always look like that is what you have tried to do without success. 2. You can re-grout if you dig out the existing grout and there are saws specifically designed for this purpose. However, be forewarned that it is a tedious and exasperating task and it is virtually impossible to do without damaging some of the tile, which would necessitate replacement. You would then probably have a problem matching the color shade of the tile. The saws are actually utilized either with fresh grout or a smaller area which needs re-grouting; thus they are not really practical for large areas. 3. The grout can be stained with a grout stain such as ‘Grout Colorant’ by Aqua Mix. Available in 22/normal grout colors, plus three vivid intense colors, Red, Yellow and Blue.
