Can anyone recommend a really good white grout cleaner. The customer asked me to re grout but i've advised giving it a clean with a good grout cleaner first. I reckon the grout has been there about 20-30years, its in a treatment room so its never been wet. Any help would be great!

Lithofin do one but I couldnt tell you what its called. Best to go to the website. Havnt used it myself but have used many other Lithofin products and all seem good. They also do a grout guard that is brilliant, so if you end up having to re grout, stick some of that over the grout when you finish to stop it staining in the future. Hope that helps a bit

give it a good clean with LTP Mouldex it has a grout whitener built in ...also with mapei fuga fresca you could re colour the joints...