Don't confuse appropriate paint thinner with ordinary paint thinner. Using the wrong thinner can cause the paint to congeal and could potentially ruin the airbrush.
You need to match the thinner to the paint, as stated above I use acrylics only, so I can use Windex with Ammonia. Actually, I use ZEP brand window cleaner with Ammonia. The brand doesn't matter so much, as long as it contains Isopropyl Alcohol and Ammonia.
Other than pulling the needle to insure it is clean, and to re-lube, I only break down the airbrush two or three times a year for a FULL cleaning, which borders on being paranoid. I've yet to see any evidence that I actually NEEDED to break the airbrush down. Enamel or lacquers may require more thorough cleaning. Others will need to address that.
When switching paints, I try to plan the painting so that I'm going from light colors to darker colors and merely spray until the cup and nozzle are clean. I don't backflush or pull the needle. I certainly don't break the airbrush down.