A couple of useful cleaning tools: Get a package of pipe cleaners from a drug store - they work really well for cleaning out the gap between the screw-in threads and the electrical connector in the bottoms of attys and cartos. Another useful tool was that I asked my dentist to give me any broken-off or damaged dental hygiene picks. I re-bent them with needle-nose pliers and sharpened them up with a small file. They're great for cleaning out gunk from the screw-in threads, and chipping out built-up crud wherever e-juice has hardened or baked on.