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Silicone is soluble in vinegar. Try applying some vinegar to the remaining residue with a sponge, waiting 30 minutes or so, then trying to rub it off (perhaps with a stiff brush).


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You can drill small holes through a typical masonry wall without compromising its load-bearing. Assuming the holes are no more than a few inches in diameter, well spaced apart and are few in number, there should be no problem. If in doubt, ask an engineer.


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Don't use mortar that has lime in it. Use Portland cement: grout. The big difference between concrete, mortar [ignoring lime content] and grout is in their plasticity or fluidity in the initial stage. That is: the constancy to which you mix it; how much water (read the label). The nooks and crannies of porous (e.g., 'coliseum') tile are supposed to ...



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