The beginning of any good clock repair starts with the cleaning. Fix as you might, it will all be a waste of time if the clock "Movement" isn't cleaned properly. There is the right way and many other ways to clean a clock. Most reputable shops will use an ultrasonic cleaner to do the actual scrubbing of the movement. An ultrasonic cleaner will agitate the cleaning solution at a very high frequency that will penetrate all the surfaces and pinions of the movement. Check with the shop that is going to work on yours and ask what method they are going to use. Lots have ultrasonic cleaners but do they have one to do the rinse of the movement also. The reasons I say that is, all cleaners have two parts. An actual cleaning agent, and a rinse. The best method to clean is with petroleum based cleaner that requires a rinse especially made for it. There is also water based cleaner that requires water to rinse it. So the point being is if you use an ultrasonic cleaner to clean the movement and then dunk it in a tank to rinse it will not get the rinsing that it needs. Reason being is that the ultrasonic cleaner will penetrate parts of your clock that the rinse might not if it is not agitated at the same high frequency as the cleaner. Then you have Anniversary (400 day) clocks that have to be taken totally apart and washed in a mid soap solution. The reason being is that the plates are polished and coated with a varnish that regular cleaning solutions would eat away. Your movement will look good for a few months but then tarnish would take over. With a clock under a glass dome it wouldn't look to good all tarnished. So once again you can arm yourself with this bit of info to go into the shop with. If you ask the right questions you will get the right answers.