The most important is to "back flush" Your
spray gun to clean it...That means hold Your finger
over the aircap, hold the trigger open and allow the
thinner to flush out all of the passages...This is the way to keep Your gun spraying clean...the outside of the gun can be cleaned with a brush and
thinner...then on a monthly basis, its time to take out the needle, install new gaskets,ect...good luck.
BB