Early Television
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Grungy Knob Cure

Are you faced with grungy knobs such as you often find on Motorola and and Philcos?  This is a simple cure.  If your wife or friend doesn't have dishwashing detergent such as Calgonite then by all means go get some. Soak the knobs until the mildew or grunge comes off.  Use a brush if necessary.  Be sure you include the back of the knob or wherever there is grunge. When the knob is thoroughly dry, coat the surfaces with polyurethane, either satin or gloss, depending on what the knob looked like before the cleaning.  Do this immediately as some of these will return to the same condition fairly quickly.

Courtesy of  Donald O. Patterson