You could clean them, but CE4's aren't really made to take apart, so cleaning them is somewhat difficult. They are built and designed as a disposable, but there are vids on youtube if you want to give cleaning and dry burning a shot. If you like their performance you may want to give CE5's a chance. They are the same thing except, can be taken apart and have replaceable coil heads.
I'm not really up on all the clearos and tanks out there right now, so i'll leave others give you some suggestions concerning that. Welcome to ECF, btw.
