I like to get as much life out of my tank's replacement coils as possible before rebuilding them, so I always open them up, clean the coil and rewick it with some organic Japanese cotton. The best way I've found to remove the gunky build-up is with my Oral-B Vitality electric toothbrush. (I have a brush head that I use exclusively for coils.) It gets everything clean without damaging the wire at all. Just wanted to pass this little trick on to anyone who has an electric toothbrush in the house.
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