Folks,
In many threads relating to issues or problems with grout, I have mentioned 'Grout Colorant' a fine quality product made by Aquamix.
Well, there is now an alternative that seems to be an excellent service/product providing a grout clean & make-over. Craig from Brisbane has started an Australian agency of a US based company called Grout Perfect. His new website can be viewed at http://www.groutperfect.net.au/
Generally speaking, if you have a tiled surface where the tiles and the grout is in good physical condition, but doesn't look great, then cleaning and grout colouring is a very good option.
Ash.