Poultice

Clay or Lime Poultice are traditional cleaning material for drawing out deep seated contaminants and staining from the surface of masonry and sculptures.
The most common use is for desalination of historic masonry suffering from soluble salt-related decay. Once the poultice has dried out it can be removed and the walls rechecked for salt content. This procedure can be repeated until the salt levels are significantly reduced.

Generally 20mm of Poultice will reduce salt content by up to 50%

Curing:

The water contained in the poultice soaks slowly into the wall and dissolves salts, soiling and contaminants, whilst the poultice shrinks onto the wall face. As the wall dries, water carrying the salts and contaminants in solution is drawn back to the surface by the high suction created by the fine pores in the poultice. The water evaporates and salts / contaminants precipitate within the poultice, which is left on the wall until it dries out; this may take several weeks, depending on the weather. 

The poultice is then removed, taking the salts and contaminants with it. Two or three cycles of poulticing may be required to reduce salt concentrations down to an acceptable level.

Made to order with a 4-7 working day lead time