In early summer there was a fire, burning roof.
I had to replace it completely, but there was one unresolved problem – when burning roof on the facing brick dripped combustion products from the roof (coating – soft roof, as I understand it – it was bitumen from it or it is roofing felt, which is maueralt).
Tried to clean the means after a fire from a construction store and solvent – the effect is about the same, leaves a dark stain, where the bitumen.
I was told to try and take the bitumen cleaner for cars, I'll try this coming weekend, but I'm not sure of the positive result.
Any advice on what to clean brickwork with, does anyone have such a bad experience?
The dark spots are because the bitumen has soaked into the brick. Try scraping off the bitumen droplets, but I'm afraid there will be scuff marks on the brick.
If chemicals do not help in solving the problem, try a scrubber, nozzle cutter, maybe if not very deep it will wash away the pressure. Or use a soft blast and sand the surface.