Hmmmm.

I compare the effort it takes to keep cleaning and debugging my detail spray gun, and it makes a bit of hassle with the rattle can nozzles seem very acceptable. I have not used Painter's Choice so I don't know if the problem is worse than I have experienced. I have used Rustoleum if I use a can.

After spraying, I invert the can and depress the button until it goes clear, or as good as I think it will. Then I pull the nozzle and drop it into a plastic mixing cup with lacquer thinner in it. I have also use xylene, but it doesn't seem to work any better on Rustoleum. I am often using primer and a couple of different colors, so I can switch to another nozzle at any time while the other(s) are soaking. A piece of tubing can help blow them out after soaking.

After spraying and pulling the nozzle, I run a Q-tip over the hole in the can. I rarely get much, but keep trying. Then I put a couple of drops of lacquer thinner in the hole and wait, wipe and repeat. It seems to work and I have not had issues with the can seals failing--yet. I also store the cans with the covers on, which might save me from a big mess if they did. I'd probably have a mess, just not as big.

Acetone might be better than the lacquer thinner as it is more concentrated. But if you are worried about seal damage, you might try the thinner first.

Good luck!

Dave