What causes fluffy crystal patches and hard, shiny film on walls?
Known as 'efflorescence', these effects appear as a result of salts crystallising in materials such as bricks and plaster. The fluffy deposits can be removed with coarse Hessian sacking or by dry brushing, repeated every few days until the deposits disappear. Hard, shiny efflorescence can be sanded to roughen the surface, then painted over.
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