Re: Restoring an unloved Bush VHF90A
I agree with Frank that plastic polishes are very good at removing opacity caused by surface damage as is often the case with vehicles that have been blasting through an abrasive environment for 100,000 miles. However most, if not all, transparent polymers also degrade with age and exposure to radiation (ie, light). Other factors, such as ambient temperature, also have an influence. This degradation takes place thoughout the material and not just at the surface.
The trouble with the transparent radio knobs/dials fitted to sets like the VHF90A is that they are some sixty years old and have had plenty of time to deteriorate. They were also made at a time when polymer technology was in its infancy and they were not manufactured with the additives used these days in an effort to delay degradation.
As I mentioned before, surface polishing is always worth a try but may not be successful in many cases.
Alan
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