[S.W. Window Cleaning]

Was using virisol today and I spilt some over some paving flags. Didn`t think anything of it but in a while I noticed they were starting to turn pink. I washed it off and that was that. Just wondering if I had left it would it have remained stained?
 Steve

[duncan h]

it shouldn't but always possible if rubbish flags. At the end of the day, they are made from concrete . Usually pretty tough stuff lol