There's one very special tool that no mechanical user should be without...
A toothbrush! Buy a designated toothbrush (as soft as you can find) for your mechanicals. When it comes time for cleaning, just take everything apart (even the switch) and fill a glass with a little detergent and hot water. Piece by piece, run it under hot water. Dip and stir the toothbrush in the soapy water and scrub in the hard to reach areas, and pay special attention to any threads on the pieces. Clean the threads well, as they tend to be the places that get dirtiest the easiest. Rinse the soapy water off, and set to the side to dry (I wait until every piece is clean, then dry with a microfiber cloth). Even after drying, I let the pieces air dry for about an hour before I reassemble.
Now, for the contacts, cleaning depends on the material. If it's the ever common brass, you can use Mother's Mag and Aluminum Polish to brighten them up (and believe me, Mother's makes them
shine!). This will also help with conductivity. Another method is to lightly scrape the bits that tough the battery and atomizer with sandpaper. This will also help conductivity, but won't look as pretty as polished contacts, in my opinion. You can also do this to any (pure!) silver/sterling pins. Obviously if your contacts are plated by anything (silver, nickel, gold, rhodium) it's best not to use any sort of abrasive, but I believe you can lightly polish them. But everything I've mentioned (except maybe silver) doesn't really tarnish enough to deserve a polishing, so I say leave them alone.
Now if your whole mod is brass or copper or whatnot, you can use Mother's to make the whole device shine, but polish it patiently. Even with aluminum, as I've discovered, a haphazard polishing job looks pretty bad. Polish the mod completely assembled... it just makes it easier and cleaner than polishing each piece separately. After the whole thing is polished, I like to take it apart for a cleaning/rinsing, just so there's no polish residue anywhere.
These are my methods, and by no means the standard ways to do things.
