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Hi - I spent Saturday trying to clean mortar from external brickwork after a bad repointing job by a builder a few years ago. I used brick acid to clean the wall, and washed it down thoroughly after 20 minutes with water. Now, though, the section of wall I applied the acid to looks darker...

Hello - I have a very small house (2 bed mid-terrace) with a draughty kitchen. In fact, it's so draughty that the central heating never reaches cut-off when the weather is very cold. I noticed that there are two air bricks, each about 20cm by 20cm (the "grid of holes" type), directly above...

I'm hoping for some advice about a damp section on an external wall. The wall in question is rain-facing, and when it gets wet, a two-metre-high section remains wet much longer than the rest of the wall. The problem area was actually badly pointed when the house was built (the mortar was very...