I was rummaging around in the garage and came across a sealed bottle of diluted vodka. It's unopened (though prolly 10 years old) but only 50 proof. Think I can still use it in my airlocks? I usually buy whatever is cheapest at my local beer store ($100 for 12 beers and a two dollar bottle of "Royal Gate." Yes, they look at me funny) and use that, especially in my Better Bottles which are ALWAYS sucking the stuff out of the airlock. 25% ETOH is sufficient to kill all the nasties, no?