04-13-2016, 10:50 PM
Sometimes that is really difficult thing to cure. As I do so many radio repairs I have invested in an ultrasonic heated bath and I run any tuning caps that need a cleaning or are noisy through the bath. They come out spotlessly clean and are perfectly quiet as well. I know not everyone can afford or even wants to invest in one but if you know someone that has one it may be worth a try and they look like brand new when done.
Gregb
Gregb