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Our outside gable wall is made of light coloured fairly porous brick and has become discoloured over last 2 years with intermittent drips from the overflow pipe from our central heating boiler. I have tried brushing in bleach to the bricks with limited success. Can anyone suggest a cheap simple...

Our outside gable wall is made of light coloured fairly porous brick and has become discoloured over last 2 years with intermittent drips from the overflow pipe from our central heating boiler. I have tried brushing in bleach to the bricks with limited success. Can anyone suggest a cheap...

Due to constant dripping from boiler through PRV ? (i think) to the outside of the house I checked pressure gauge on boiler and it was in the red over to the RHS of the gauge - heating as only been on intermittently but constantly used during summer for hot water. I tweaked the PRV knob and...