...in your airbrush cup because nothing will happen. I did not notice last night I cleaned everywhere except the airbrush. This afternoon, about 18 hours later, when it was paint time again, I saw the gun still had a bit of paint in the bottom of the gun. Out of interest I pressed the trigger and it sprayed. I did not add more water or anything. I just continued where I stopped the night before. To clean was the same as if I just used fresh paint. A 1 minute spray and back flush exercise and the gun was clean. Thanks E'tac.