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I also have restored 100's of "sealed"? noisy controls by pointing the control shaft straight up vertically, wrapping something around the bottom of the control to catch the excess contact CLEANER/LUBE, spray around the base of the shaft where it goes into the control, and "pump" the shaft up and down and give it time to "pump" the contact cleaner/lube down into the control---remember patience is a virtue.? If at first it doesn't seem to be getting the spray down the shaft, make a dam" just below the point where the shaft enters into the control and try spraying a little additional cleaner/lube into that area keeping it saturated and at the same time periodically "pumping' the shaft up and down to allow the cleaner/lube to migrate along with capillary action down the shaft. Allow the potentiometer shaft to remain pointed up vertically. Sometimes it can take overnight or longer to get the cleaner/lube down into the control but I have found over the last 50-60 years that it very, very rarely fails. Just be patient and I think this will work for you, even for the difficult ones. I remember setting upright on their backs some of the big monster stereos and doing just that, especially when the potentiometer access was not readily accessible even with the long extended flexible tubing that sometimes came with the contact cleaner/lube or that were also available at the time.?? ?I also remember running into some well sealed potentiometers and TV tuners that we had to drill a small access hole into/through the metal or plastic housing to get the cleaner/lube inside to do its job. Just be very careful to not drill into the tuner or control doing any internal damage. I remember disassembling throw-away pots and tuners to learn where to drill the holes to prevent any internal damage and you could then seal the hole up with solder or glue when you completed the cleaning/lube process.? ?One additional point, DO NOT use a contact cleaner with no lubricating agent in its ingredients. Many years ago I attended a Channel Master seminar on their contact cleaners and tuner (and switch) cleaner/lubes. The company representative showed us under a fairly high-powered microscope a video of what happens when you spray a contact cleaner (with no lube) on the old TV tuner switch contacts? You completely wash away all lubrication from the individual contact points and he showed us under the microscope what happens when you rotate the switch thru the washed contacts. It scrapes the plating off the contacts and now being unplated in that area it is oxidizes and you end up with intermittent high resistance contacts down the line(with time) that play havoc with your circuit. You think that you are "fixing" the intermittent switch contact(s) (or the intermittent internal potentiometer wiper problem) but in reality you are totally ruining (for the future) whatever you are so-called restoring by using a non-lubricated spray.? ?I wish the video that the Channel Master rep showed us was still available>>>>it looked like a chisel scraping the plating off the contact under the high-magnification microscope when all the lubrication had been previously "cleaned" off the contact areas. He said DO NOT EVER use a contact cleaner that has no lubrication in it or at least follow up the "cleaning" process by spraying or adding some additional lubrication to the contact points.? ?Hope this is helpful information to some of you, it sure was for me.