Shining up a Dull Insulator

Reprinted from "INSULATORS - Crown Jewels of the Wire", January 1974, page 21

RESEARCH DIVISION

Dear Dora,

Recently I purchased one C.D. 143 and one C.D. 190/191, both in a beautiful deep purple. I am very happy with both, as they put some finishing touches to my color scheme. However, I have been unable to get a nice gloss on them. I have attempted with coarse steel wool and muriatic acid to clean up these insulators. So what I would like to know is "What's the secret?" Any information will be greatly appreciated. Thank you very much for your help and your magazine. 
Sincerely,
Brian Smith 
4312 Virgusell Circle 
Carmichael, CA 95608

P.S. The C.D. 190/191 is Canadian (<>) 

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Dear Brian,

Some insulators, it seems, just never clean up real well, but Don uses "Endust", bought at a local supermarket, a spray for dusting furniture and using on dust mops. It has an oily base and really gives them a shine for displaying. Spray heavily and let set overnite and then wipe. You may have to repeat several times. Good luck.