This is commonly known as wall salt or moss insulation.
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Any type of dam on the wall, floor or roof of the house acts as a cure or prevention.
In older homes it can be used to prevent or remove any type of dam.
Rub the dam area well and put the plaster and pour James Bond's DAMP FIX. Yellow foam-containing liquid will come out. Dry the area well without using any water. Re-plaster after a day. You will see the dam feeling is gone.
However, it will easily clean the floor or bathroom, kitchen hard stains, oily dirt, algae or iron stains and brings a sparkling feeling.
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