A damp sponge(rinsing the sponge in between wiping) repeatedly wiping the tiles until they are clean to the touch...
Best Way To Remove Dried Grout From The Outside Of The Tiles?
Dampen the grout you want to remove, as Nomad says, then use a razor scraper at a 45 degree angle if there is any that's too thick to remove with the sponge.. Don't know if this is the best way, but it is they way I remove dried grout from tiles. Not sure what you mean by (outside), of the tiles.
If you have removed a piece of tile and want to clean the grout off of the outside edges, you can use a small chisel.
If you have removed a piece of tile and want to clean the grout off of the outside edges, you can use a small chisel.