I picked up one of these inexpensive Ultrasonic Cleaners from Goodwill today.
http://www.amazon.com/Ultrasonic-Jew...ef=pd_sbs_op_3
Mine was really inexpensive since I got it used for $4.95 but new they're only about $30.
It's small, only holds maybe a Pint of water.
I really didn't expect it to work at all, it looks like cheap junk so I figured it would be mediocre at best, boy was I wrong!
I tried it on various small objects that would fit in the tub, added warm water and about a teaspoon of TSP and the results are pretty spectacular!
It's especially effective at cleaning knobs, three minutes in this thing and they come out spotless, all the gunk in the grooves is gone, the numbers even look brighter because it removes the grease that has built up on them.
If you see one of these used somewhere pick it up, it will come in handy!