I just thought I would mention that I found a really good little gadget for removing grout from bathroom tiles. The original grout looked as if it had been put on with a trowel in my new house, although the tiles were ok, I was told it was a terrible job to remove it and I would be better off pulling them all off and starting again (no money, big problem!) I thought I would have a go anyway so I bought a Plasplugs heavy duty grout removing tool from a local diy shop and got going. I found it easy to use and it removed all the grout, a bit messy but what a money saver!!