SS 509-1:2005
[Withdrawn]
Code of practice for cleaning and surface repair of buildings - Cleaning of natural stones, brick, terracotta, concrete and rendered finishes
...Pavings, shrubs, plants, tree roots, etc...
...Contractors should study and understand the MSDS (Materials Safety Data Sheet) of the chemicals
used for cleaning...
...NOTE The types of chemicals selected should not affect the structures or the supports of the fabric...