sometimes things work out okay...

I made my own before I realized that it could be purchased commercially. If you ever want to see really corroded and stuck pots, try the marine radio business. The problem is that the pressure from the typical spray cleaner is insufficient to break loose a really rotted shaft. So, mine has a compressed air fitting attached. Point the pot upwards, screw in the adapter cap, pour in some penetrating oil, apply air pressure, and the pot is either cleaned or destroyed. It works fine for open unsealed pots, but sometimes causes problems with sealed or plastic rectangular pots, which tend to fly apart with too much air pressure. I usually use about 20 psi for ordinary pots, and only 5 psi for the sealed variety. Also, be prepared to have penetrating oil sprayed all over everything that's not protected by a rag or twowel paper.

Reminder: Point the pot upwards or you won't have a good liquid tight seal when applying pressure.

Agreed ! But a 20 cent sleeve does the job and it doesn't matter if it gets lost or damaged in the tool box.

I agree 100%. Have used that method before.