Cleaning vertical dormer tiles

[vards01]

Does anyone think a brick cleaning acid would do the trick? I have never used this before so would appreciate any pointers in terms of brand application etc.......

 

[Cumbrianroofer30yrsexp]

Does anyone think a brick cleaning acid would do the trick? I have never used this before so would appreciate any pointers in terms of brand application etc.......

I would say it would stand a fair chance of doing so.

 

[datarebal]

if that fails why not just retile it .. it is barely 110 tiles with a little cutting.. a mornings work.

 

[Dodgydave2]

Just spray it on and leave it no brushing or messing around