Pretty much what Randy said,, I flush it with a generous amount of clean thinner,, then when I change colors, or am done, I will take the fluid tip, and air cap off, Using a small acid brush, I will clean up any obvious residue, AFter that, I will use compressed air and blow the passages on both tips dry. Sometimes residue will stay there and the air will blow it clean. ( uh, make suer you have a good hold on the parts, you do NOT want to have them go shooting across the room, ask me how I know)
I generally leave the needle in place, though depending, I do take it out sometimes, but I dont like to as you end up cleaning all the lube off the seals that way. REassemble the gun and store it.
Thats about what I do,,