click hereIt is condensation from the boiler outlet. So far, I have tried a jetwash and meths.
Try a wire brush, it needs something very abrasive to scour the top surface.
Combustion products are usually acidic, so you might like to try something alkaline - washing soda, for example.
Soda Crystals cheap and a wire brush. Also wear very good waterproof gloves. I had a cheap pair on and the stuff burns. (Still got sore finger where gloves leaked)D
Is it a condensing boiler?
If so the condensate should that collects in the flue should be draining back into the boiler to drain from the boiler into a drain.
I'll try those.ventad, no, conventional.
Spirit of Salts and a stiff brush,a wire brush will permanently damage the service of a brickclick here
Will this shift it, I wonder click here?
I have used neat domestos to successfully clean a marble grave memorial, don't know if it's suitable for brick...just brush on, leave for a spell then wash off or leave the rain to do the job...
Stain of this sort is about as tenatiuos as it gets. Probably carbon and a few metallic traces.Spirits of Salt would be a bad idea, as purchased it is a diluted commercial grade of Hydrochloric acid.Will make no difference to carbon and will certainly attack mortar and even some bricks.I think water and a wirebrush are safest though tedious. The black particles will have penetrated any porus suface and only by wearing down the surface of the brick will you make it look better.It may be the boiler isn't quite up to scratch? A son has has had one for years and doesn't have any stain on a rendered, painted, brick.
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