I bought one of the jewelry cleaners that has plastic cups that fit into a base that vibrates when turned on. The vibration is supposed to impart a "sonic" wave pattern that gets into the smallest cracks and crevices of things like rings, bracelets, etc.
The mistake I made was adding the restorer right into the plastic cup of the jewelry cleaner. When I came back to check on it a little later the solution had turned a milky color. It was eating away at the plastic cup. This solution had gotten into the nozzle and after pulling the nozzle out so I could clean up the mess the plastic then hardened inside the nozzle and there was NO getting it out.
After that fiasco I started using a shot glass placed inside the plastic cup with the restorer in the shot glass, but was never really satisfied with the cleaning job it did. I finally learned to keep my airbrush clean and that solved all my problems. Very rarely do I have to use the restorer these days and if I do I clean the airbrush as I normally do and then I let the front of the airbrush soak in the restorer for anywhere from a couple hours to overnight. After the soak it's given another normal cleaning to remove any gunk that was softened by the restorer. I may only have to use the restorer once or twice a year. If at all. The jewelry cleaner is now sitting on a shelf gathering dust since it's no longer used. IMO there's really no replacement for a good cleaning regimen.
You need to be extremely careful when trying to clean out anything from inside the nozzle with something that doesn't belong in there. Some folks will use the airbrush needle to try and pick stuff out of the nozzle, but even that can screw up the nozzle as well as the needle. The inner walls from the factory are smooth and any scratches on the inside of the nozzle can effect the way it sprays.
When I'm cleaning my airbrush I always check it at the end of the cleaning to see if it is truly clean. I do this by adding some acetone (that is what I clean my airbrush with) to the bowl. I then place my finger over the nozzle just like I was going to back flush it. The trigger is then pressed down, but I don't pull back on it. If I see any bubbles in the cup I know the needle isn't seated properly so it gets cleaned until there are no bubbles showing up in the cup.
hope some of this helps,