I dont, but I work at a desk job. Just a rinse once in a while is all I ever do. Rarely do I put the mod in my pocket and I try to clean off the top as best I can with a qtip before I open it up to refill. If you get junk in there while filling, it'd probably be a good idea to rinse the bottle between fills. Depending on the junk that makes it into the bottle determines the cleaning needed. If you accidently get pocket lint inside the bottle, a rinse in warm water will do.
ejuice is hydrophobic so water does a good job with cleaning. If you somehow get some nasty junk in there or the threads are looking pretty funky, a more thorough cleaning would be in order with soap and warm water and maybe an old tooth brush. Stay away from alcohol, it doesn't play well with silicon. Some people boil their bottles for a couple minutes. Never saw the need for that but if the
juice has completely solidified inside the bottle and the entire thing got covered in maple syrup, I guess I'd boil it then, or throw it away and start with a new bottle.