How does one remove water stains from exposed beams ceiling?. Some are on the beams. Some are on the ceiling boards (which are the underside of the floor above). The wood is not painted. The stains are probably a few years old. Some probably resulted from bathroom leaks, others from rood leaks, others from water infiltration around windows.
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I want to hang shelf on wall but wall sounds hollow when I knock on it, not like the brick walls back home. how I hang something heavy on wall like this...
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