On Mon, 13 Jul 2009 23:50:08 +0100, F news@nowhere had this to say:

On 13/07/2009 23:04 Harry Bloomfield wrote:

Get a tile grout scraping out tool, scrape it out and regrout it?

I was trying to avoid that and was hoping that someone would come up
with a magic liquid like what you see on telly: sprinkle 5 drops on a
cloth, wave the cloth in the general direction of the tiles and they
sprout little golden stars which go 'ting'!

No?

WD-40 of course...

--
Frank Erskine