Is there some way to smooth grouting after it's dry? The guy who tiled our bathroom did a real crap job of the grouting. It was squee-geed on, but not finished and shaped with an indent tool. It's now dry. And he's been sacked. Basically it's uneven and not really been 'indented'. The gap is 3mm according to the spacer packet. If the tiles were not all white it would be a disaster. Thanks for any advice.
MikeyP