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You'll hear a lot of good opinions about control cleaners and there are fancier cleaners for sure, I've got some of them. But I have also used a few drops of WD-40 on controls for years and so have a lot of other people, and it works for me. You don't want to soak a control with any product, though. I usually use CRC Electronic Cleaner available from auto parts, and then a drop or two of WD.
You may have an intermittent resistor or control causing the set to jump from static to quiet. The heat/freeze method should show up a fixed resistor. Turning the control slowly to all of its positions while wiggling the shaft might show up an intermittent. With set off, connecting your ohmmeter between center lug of the control and to either end and then slowly rotating it should show a smooth progression on the meter, not jumping around.
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Reece
Perfection is hard to reach with a screwdriver.
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