"choco" wrote in message m...
"John" wrote in message
...
Hi all

Has anyone tried these "grouting renovation" products you see in the
sheds? They look expensive and very fiddly to me; I'd be prepared to
put up with both, if the end result is as good as they say, but it's
better to get some opinions first if I can.

The one I tried was just like an acrylic paint sitting on top and rubs off
very easily when wet. Neat thick bleach left overnight and scrubbed in with
a hard brush can be quite effective.

Not an easy problem.

Dishwasher detergent and hot water is pretty powerful. Bleach will
shift some things.

Last resort is mild acid. It attacks the grout, eating the top layer.
Risk, , but worth a go if your only other option is regrouting.

NT