Wondering is Vodka would be better in a air lock when brewing lager because of the long fermenting and ageing processes. Have read brewers using it. Always have used Star San in my air locks, but have notice it becoming cloudy after the yeast slows. Just finish a Diacytl Rest on my first lager and the air locks were cloudy until the yeast became active, so I don't think it's a problem. Have read of brewers mixing Star San with distilled water and using for a year. Seems Like it could get expensive using Vodka in High Gravity Beer, with blow off tubes.