Not until after the plasterer has left the job should the face
brick be cleaned or washed down. This is done with a 5 per cent
muriatic acid solution or about one pint of acid to four gallons
of water. A stronger solution is likely to do injury. Apply with a
good scrubbing brush to remove all dirt and spattered mortar, and
then rinse with clean water. While washing the wall, defects in
joints should be pointed up.