Wow! From hours to 5 days. Quite a variance in how people clean their coils with vodka! I've tried 24 hours, seemed to work fine. But who knows, perhaps an even longer soak is beneficial.
I use cheap vodka as I'm not comfortable using isopropyl alcohol
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Yeah isopropyl alcohol is de natured wich is put in to prevent people from drinking. So I don't trust it either.