[Eliot Ness]

Those 4 I tried initially to clean with Windex (and then you told me not to) do not look any different than the 5th one that I did not touch with Windex

I've never tried Windex, but 409 cleaner severely dulled a set of Bakelite knobs on me a long time ago. Since then I've never had to go any stronger than a good soak with spray Pledge.

Agree with TA on the metal polish if needed. I had a pretty dull Motorola 56H and my (current) favorite metal polish (Satin Gloss) made the cabinet and knobs look like new.... I was impressed.