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Mix up a slight salt solution in tap water.Then mist the wires and cap down with a spray bottle.If you can do it where its a bit dark even better.Thats all I used at work for 30 years.Found many bad wires ,caps and plugs that way.Sometime you will get a carbon track on the plug porcelian and great what you have.Rocky



I have done this for over 30 years also!! Poor man's scope Works like a charm!