Moonshine wash shelf life?!
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Wash is nothing more then the fermented beer you distill. It tends to be sour as it often infected with things like lactobacillus. But since you do not care about the taste (it is to prep the still), simply keep it in an airtight container (that was sanitized before use) and refrigerate it. For that matter making it is fairly simple just throw it out and make some more when you need it.