I would like to know how to clean the exposed stones of the interior walls of my house?
If the walls are not too dirty or covered with plaster, try cleaning them with pressurized water vapor (or the lowest pressure washer), then scrub them with a brush of medium hardness. Then wash and rinse. If the joints are also a bit dirty, apply a whitener and let it work. Perhaps the most effective solution would be to rent a sandblaster to strip the walls, but it will have to be emptied of all its furniture and accessories. It will also certainly remake the joints lime mortar? Be careful to equip yourself with all necessary safety equipment (glasses, coverall, etc...).
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