need something to break down this lot, tried sts but it wouldn't touch it, picture show before and after, but it took us half an hour and a lot of scrubbing to get the after picture. altro flooring which has alloy flakes in it, some chems turn alloy flakes black so i need someone that know about this. phone number so i can have a chat would be better or contact me on 07854690355, i'm out most of the day tomorrow so may not be able to check ciu.