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Denatured alcohol removes paint from plastic phone cords and hard plastic housings for me. Not isopropyl. Denatured alcohol is a pretty good solvent and kind to everything but Tenite and older 1950s plastics, but your sign has the 1969 RCA logo, so it's later.
DA could also remove some of the outdoor grime from the rest of the sign. But to be sure, try it in an inconspicuous place first, as you should anything that might damage or cloud the plastic, just to be safe, and see if any color comes off.
I remember those signs from my days traveling with the family to Florida and Pennsylvania. First thing out of the car my sister and I 1) Found out if it was a color TV and 2) Found out what kind of ice was in the ice machine. I remember those RCA 19" TVs they used too.
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