Cheap lacquer thinner is the way to go...
One of the most important things to do to clean
a spraygun is to turn the fan off tight, then with
a cup of thinner, pull the trigger wide open then
put it over the nozzle...this call back-flushing
the gun, skip Your finger back and forth blocking
the nozzle, then take You finger away...If I have
an overall paint job to do, I will use a 2 quart
pressure pot, and complete a paint job in 30 minutes....Bill B