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Registered
Join Date: Oct 2005
Location: Capistrano Beach, Ca.
Posts: 7,235
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Looking back, I tend to agree that what you show is efflorescence. Notice the blocks stacked to the side that haven't been glued--they have the same white marks. If that's the case, then do as suggested and clean off the residue and, if possible, put a moisture barrier between the blocks and the dirt behind.
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L.J.
Recovering Porsche-holic
Gave up trying to stay clean
Stabilized on a Pelican I.V. drip
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