@mylesuy the how is not as important as with what you clean it. If you are going to go ultrasonic, you have to make sure that you have the right cleaning agent like Kemet 12 etc.
Once cleaned and dried, apply a light coat of 3-In-One or even some Permatex spray lubricant (I am not a WD40 fan ;-) to keep any corrosion at bay.
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If nothing else, you could try some at-home nickel plating :-)
@mylesuy the how is not as important as with what you clean it. If you are going to go ultrasonic, you have to make sure that you have the right cleaning agent like Kemet 12 etc.
Once cleaned and dried, apply a light coat of 3-In-One or even some Permatex spray lubricant (I am not a WD40 fan ;-) to keep any corrosion at bay.