I received a free bag of local wheat. Upon opening it to start a batch of sprouts, there are weevils, which is ok, though fewer grains to sprout, but when bagging up to put in the freezer, I see there are also clumps of dust in the middle and bottom. The dust I assume to be the feces, but clumping indicates moisture, right? Is this bag usable for sprouting at all? I was thinking of treating with some vinegar in the soak, then if there is no mold growing, is that safe?