I don't I drop in enough baking soda to fill half the atomizer and then I use a syringe filled with 10ml of vinegar and spray it in and let it bubble I repeat the vinegar till all the baking soda is gone. I sometimes repeat the process 1 or 2 more times depending how much juice I used from the last cleaning.

I also do this to clean my eGo-T tanks too! If the atty/tanks are really smelly (from the last juice used) I will add a step to the cleaning. I will do the baking soda & vinegar then backing soda & lemon juice then another run of baking soda & vinegar. I'm a clean freak what can I say! When you are done just rinse everything with water. HTH!