What is in solvent that makes it work?

I am one of those guys that never seems to have enough time to do what needs to be done. As you could probly guess, cleaning gets overlooked sometimes for a few days. So I got an idea that if I were to take a piece of PVD and cap one end and put a threaded cover on the other side then fill it with cleaning solvent it would be real easy to just remove the barrel and put it in the solvent as soon as I get home. Then in a day or 5 I could finish the job and put the gun away. I am concerned about posible rusting of the barrel and the cost of solvent to fill the PVC. Is there something else I could use(alcohol, gas, WD40, exc.) that would help to clean and prevent carosion while it sat for a few days without rusting?

What do you think for this? Is this even fesable?