I have seen a few posts about soaking these coils in cheap vodka. I use EUC 0.3 & 0.6 ceramic coils, they seem to gunk up quickly with my favourite banana vanilla custard mix. I found if you soak them in 6% hydrogen peroxide for a few days, it will clean them like new,the bubbles produced indicate that is is working,dont forget to rinse thoroughly & let them dry before you reuse them.I soak my tanks in peroxide & it doesn't damage any seals,removes odours.I have tried it on Veco stainless steel & my horrible leaky rainbow kylin. I wouldn't try it with cotton coils,as it may destroy the wick. So buy some nice vodka & enjoy,use hydrogen peroxide for your cleaning.