This is something I have been doing for a while. After I empty out a spray can, or leave it without unclogging the nozzle, I take it off and put it in an old jar, maybe from Jelly. Its empty of course. I fill the jar with Super Clean, can be found at Wal-Mart in the automotive section in a 5 gallon jug or a spray bottle, then I put the nozzles in the jar and let them set. You will have to take them out to wipe off the paint, but I usually let them sit. Hope this tip helps you guys.