[Chuck Schwark]

Hi,

I think I see the culprit - Hexane. I looked up the material safety datasheet on line. Main ingredient is Hexane (used in a lot of anti-ox cleaners) leaves behind an oily film to helps prevent future contact corrosion and oxidation. The "quick-dry" feature means that the volitiles evaporate and act as a vehicle to spread the anti-ox residuals.

This type of cleaner is also a BIG no-no for phenolic wafer switches and phenolic tube sockets, as it soaks in and is very difficult to remove. You may have some of this effect on the tuning gang phenolic stator brackets under the trimmers.

Chuck