I am still somewhat of a novice when it comes to the use of an AB, and I am as a rule not that anal about cleaning stuff.
However I must be in the minority because I have a DA Badger Crescendo and I strip it and clean it after ever use ( meaning in between color changes as well).
I just got in the habit for some dumb reason as I never wanted to have any risk of mixing the colors even slightly.
I simply dip a pipe cleaner in thinner and run it through the cavity of the AB not touching the air valve, and i wipe down the needle and the tip with a rag damped with thinner. Both things of course after I spray some straight thinner thru to flush the AB.
It is a colossal PITA and probably wastes a lot of time needlessly but I can’t help myself. Plus my AB sure stays clean and operates well.
Swede