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for the salt stains, i would use water and woolite, the laundry detergent, mixed 8:1 (8 parts water, 1 part woolite) and a stiff brush.
for the 2nd question, you probably have a defective vapour barrier. try vacuuming out the water and seeing if it returns again. (just make sure you clean that area so it doesn't mold, etc)
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