[mick101]

hey up guys and gals does anyone know of a chemical that will get white grout back to white , the job is a washroom that has had a fire i have been in to do the cleandown and the tiles and every thing else has come up like new. but now the client has asked me if i can get the grout back to white which will make him very happy , and me too 
regards mick

[Roger Oakley]

Bleach  Use an old tooth-brush to gently scrub the bleach, domestos etc would be fine for this. Then rinse off.

[mick101]

cheers roger 

[murky]

We used to do loads of fire restoration work, if you do as above the soot  will just 'wick' back up and will show grey after a period of time.

Best thing to do is to scrape out just below the soot, wash as described above and then regrout, it looks so much better.

Murky

[mick101]

cheers murky just getting into fire restoration 
regards mick

[drive surgeon]

yes i have used bleach before, it works

[Paul Chapman]

Try Aquamix Grout Recolourant available from Trades Direct.