I always swish reducer around in the cup and get it cleaned out then perculate it with clean thinner and repeat the perculating a few times until the reducer stays clean, i only take my gun apart to clean it about once a month or after i spray white ( how to perculate - turn the air down to about 5 psi and take off the cap and barely screw it back on hold a rag tightly in front of the cap and pull the trigger - the gun basically cycles the paint out of the body and cap back into the cup if you hear it bubbling its working if it doesnt bubble check to make sure the cap is barely threaded or up the pressure a couple of pounds - DO NOT PUT THE LID ON THE CUP WHEN YOU DO THIS