I'll take a new RBA or mechanical mod completely apart and soak the parts in hot soapy water for about 10 minutes. I'll make sure to rinse everything off and I wipe it all down with paper towels. I then take a toothbrush and toothpaste to all threads and rinse them off. Finally, I put everything in an ultrasonic cleaner for two cycles and again wipe everything down with paper towels.
It may be overkill, but I really dislike the taste of machine oil.
If you use vodka or another type of alcohol to clean your gear, you should remove any rubber o-rings - it could ruin them.