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Thanks for the feedback everyone and for putting my mind at rest somewhat!
I've brushed off the majority of the crystals and the wall...
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Thankyou both for the prompt responses. Aside from brushing away the crystals, should I take any other action? I suppose I'm trying to...
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Hi there
Efflorescence has formed on the outside wall of our house. It's under a car port so pretty unexposed to the elements, however...