hi there,
there are two or three companies, that actually repaint these tiles, they go into a closed shop, sheet it all down work overnight then leave, apparently its cheaper than reaplacing them.
if i remeber correctly, the paint on the tiles originally has a fire prevention quality, and that can be removed if not done properly.
these companies respray the tiles, and renew them.
regards
martin
ps saying that we were going to have to do a job where we took all the tiles out, washed both sides and refitted, our client told his landlord to take a running jump, too expensive.
regards
martin