I bought industrial strength Concrete and driveway cleaner that says is useful for brick as well and this did not help. I pretreated the house with my pressure washer at a low pressure and then used high pressure to wash it. The dirt and even some of the grout/morter came out but the black mold stains still are there. I even tried it full strength and this still did not help. Does anyone know of an acid or something a little safer than acid to use to remove this from my brick. I am sure it has not been cleaned in a longtime. I have all the dirt removed I just need the stains removed.
Again, I used a contractor strength cleaner, at a LOW PRESSURE setting, just to pre-treat it, I let it stand for 10 mins and NONE of it came off. I am using full pressure at 2700PSI, I believe that would be plenty of pressure. I pressure wash houses and roofs, it is jus this one house, that has not been cleaned forever, will not come clean. Thnaks for any answers.
Again, I used a contractor strength cleaner, at a LOW PRESSURE setting, just to pre-treat it, I let it stand for 10 mins and NONE of it came off. I am using full pressure at 2700PSI, I believe that would be plenty of pressure. I pressure wash houses and roofs, it is jus this one house, that has not been cleaned forever, will not come clean. Thnaks for any answers.
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