Very True. I just rinse out the residue from my carboys before storing and do the sanitizing only when I'm ready to put them back into use.Regardless of how you store them, a careful check and re-wash or sanitizing rinse is a good move. I've sanitized carboys, stored them for 4-6 months with a paper towel tied over the end and still occasionally found a spot of mold or debris inside. I'd thought the stars and liquid would evaporate an leave the carboys in a clean state - but sanitizers can lose their effectiveness before they dry provide moisture for mold.
So clean and store but be prepared to repeat the whole process of left more than a week.
I've even gone to refresh an airlock that was a just little low only to find fruit flies hiding under the translucent cap. In those cases the flies were dead but...
Good process for cleaning, , , , I drain everything inverted, when dry carboys have a paper towel rubber banded over the mouth so I don’t have to rewash when used again and risk of mold is reduced.Ask 20 winemakers that question, get 21 opinions. I run water through hoses, clean any obvious dirt, then hang. Carboys, I wash throughly, use a drill carboy brush. Add a small amount of kmeta solution, then put a solid bung in. Generally mine aren't stored for long.
As a last step, consider inverting carboys for several hours before sealing with saran wrap. The goal is for the inside to become completely dry.
Been making beer and wine for 10 years and never even thought of covering empty carboys. I just clean them after use (wine is easier), rinse with starsan and drain.
When I go to use them again they get a quick rinse with starsan. Same treatment with pretty much all equipment. Never had any issues.
The only reason I stick some Saran Wrap on the opening is to keep spiders, etc. from getting in there.
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