The most effective advice for removing saltpetre and mold from walls

Below we offer you a tip that is certainly among the most effective. You need:

1 wire brush
a bottle of hydrochloric acid
1 brush
container with water and soap
concrete
sealant
Painting
Wear a mask, gloves and goggles to protect your eyes. Using the wire brush, remove all the saltpeter from the surface of the walls.

Mix one glass of hydrochloric acid with three glasses of water and mix with the brush until perfectly combined.

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