Cleaning mixing jars - best method

I use siphon feed badger brushes, so I mix right in the jars. I have about a dozen now.  I clean with thinner, sometimes with that eco-green soapy stuff. I used to use lacquer thinner if there was really dry paint in the bottles, but ruined several caps that way, so I do not use lacquer thinner any more.  Means I do have to have the discipline to clean bottles before too many days go by :-(

I learned from a commercial artist who gave a demonstration at our club meeting that there is no need to do anything messy or complicated.  He put a few drops of paint in the gravity feed small cup on top of his airbrush, then dipped a paint brush in solvent, dipped it in the paint cup, and mixed it up a bit with the brush, and it worked just fine.  No extra jars to clean up, just the airbrush and the paint brush.

I assume the author uses a fixed cup or cavity (double action gravity feed), not a detachable one. So, one can mix the paint to a good concistency before transferring it to the AB. However, if you have a detachable cup you can just mix in that cup and then attache it.