Efflorescence on brickwork

stuart45

Could be lime run off. Any calcium oxide in the mortar will come to the surface when the joints are soaked as calcium hydroxide.
Absorbing CO2 will turn it back into calcium carbonate will will become rock hard.

FreeBear

Have you tried cleaning the affected area with a dilute brick acid ?

That would get rid of the white deposits, but you do need to wash the wall down thoroughly afterwards (preferably with a sodium of bicarbonate solution followed by a hosepipe).

PierremontQuaker03

FreeBear said:

Have you tried cleaning the affected area with a dilute brick acid ?

That would get rid of the white deposits, but you do need to wash the wall down thoroughly afterwards (preferably with a sodium of bicarbonate solution followed by a hosepipe).

thanks, any tips? As you can see it is in an awkward place and I will most likely have to clean it with a brush hanging out of the window, so maybe I should try a simple method first? 

stuart45

Try just brushing it off first.