white residue from brickwork

[colin H]

Does anyone know what the white residue is that comes out of brickwork - and how do you shift it ???

 

[JohnD]

efflorescence.

Time
or an acid cleaner.

 

[Nige F]

"Ticking away the moments that make up a dull day, fritter and waste the hours in an offhand way."................Man , Cleaner on Acid.....DSOTM on the platter .........use a stiff brush, like, bass broom Man