This article is from the Antique Radios And Phonographs FAQ, by Hank van Cleef vancleef@netcom with numerous contributions by others.
The best methodology for using any of the above solvents is controlled
application, to assure that only the parts to be cleaned by the solvent
come in contact with it. In most cases, soft cloths and Q-tips work
well. The best soft cloths were cloth baby diapers, which have been
largely displaced over the past thirty years by disposable diapers.
Start by vacuuming off the loose dust. A small paintbrush and some
smaller brushes, such as those sold for basting poultry, can help in
loosing dirt. Follow up with a mild soap and water solution applied
with a rag. A soft toothbrush can reach into inaccessible places and is
particularly valuable in cleaning up knurled metal parts and fluted
knobs. Use Q-tips moistened with solvent to reach into inaccessible
areas and to "spot clean" specific areas.
 
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