m4rky

Well the tiler wiped over with a sponge after he had grouted.
Then I let it all dry for 24hrs before trying to get the rest off.
Some of the residue has gone but the tiles are still quite milky coloured.

My wife spoke to the tiler today and he expected that it would all come off no problem and he was surprised.
He suggested I try a kitchen/dish brush with water and if it still doesn't shift then he can come over and use a weak patio/brick cleaning solution.