Are the coils the part with the fiber wicks? Can you clean them? I have a iclear 16d that I have been throwing out and replacing the coils, I think, when I switch to a different flavor. They are pretty inexpensive but if I don't need to chuck them so soon...If I keep the same flavor, I use them for about 6 days. Is that correct. They don't taste burnt, but sort of metallic after that long. OMG this is sooo confusing. But still way better than real cigs. Help guys...