I don't "clean my mod" per se ... I wipe down the 510 connector on both the tank and the mod when I fill it back up. Periodically I also rinse off the tank parts then soak them about 1/2 a day in Everclear, wipe them off, and that's it. I do inspect the battery tube, and if there is anything in it, blow it out with compressed air.
Pretty simple, so I'm sure I'm doing it wrong!