On Mon, 15 Nov 2004 15:43:40 +0000, John wrote:

The particular problem I have is that the plain white tiling in our
bathroom is in good order, but the grouting's grubby.

Have you tried Dettox Mould & Mildew remover? (no, I do not work for
them, or anyone selling it!). I have been quite surprised at the
greyness that shifts. Watch out for the fumes - largely bleach, by the
smell.

Regards, VivienB