Oh I forgot to mention, I just did a half-baked experiment...
I put the deck of my kayfun in the ultrasonic cleaner, with a gunked up coil. Did 4 x 4 minute cycles and the coil was hardly any different from going in.
So I guess from my angle, and with the equipment I have - my theory is pretty bust - however, I didn't use Vodka, I used warm water and dishwashing liquid just to have a look. Vodka may clean the cotton a little but I doubt it will do anything to the coil. If it did dislodge some gunk from the coil, I am sure it would simply end up in what was left of the cotton.
I put the deck of my kayfun in the ultrasonic cleaner, with a gunked up coil. Did 4 x 4 minute cycles and the coil was hardly any different from going in.
So I guess from my angle, and with the equipment I have - my theory is pretty bust - however, I didn't use Vodka, I used warm water and dishwashing liquid just to have a look. Vodka may clean the cotton a little but I doubt it will do anything to the coil. If it did dislodge some gunk from the coil, I am sure it would simply end up in what was left of the cotton.