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How to clean bitumen stains from facing brick?

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?

• brick
• facade
• bitumen stains