"Noisy" controls are nearly always an oxidation (or dirt) problem (see Fountainhead's comments above).
Spray a liberal amount of contact cleaner into the body of the control and spin the shaft/knob back and forth 5-6 times. Let contact cleaner evaporate and retry control. Repeat until "noise" disappears. If not fixed after the third spraying, you may have a different problem.
You now have clean contacts but they are dry and will wear out sooner. Not a big deal for most consumer controls so you can skip this step, if you want. Squirt the smallest amount you can manage of a dry lube (eg, silicone spray) into the body of the control and give the shaft/knob a few twists. Don't use graphite as it is conductive.
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