3f2c04aa_ick___Cleaning___Stain_Removal__Description
[Stain] Calcium Stains [Cause] Most commonly these stains arise from products of the setting reactions of portland cement and bricklaying sand containing clay. [Removal] The application of Noskum or an equivalent product at full strength will usually remove these stains. [Description] 
Appear as almost a milky film on the brickwork. These hard white deposits are invisible when wet but insoluble in water.
Brick | Cleaning | Stain Removal
Description