Kevin, VE1TV wrote:
I'm really surprised that no one has observed that smoke is actually the
reason radios work at all. I recall being taught that once the smoke is
released, the radio usually stops working. I'm pretty sure the smoke is
contained inside those little glass bottles...

This is all of course moot, if the smoke is known to have come from another
source.

BTW, Fantastik, Spray-nine, 409, and many others are mostly NAOH solutions

No, they are not. Read the ingredients list.

and are eschewed by the conservators. Murphy's is, I think, saponified
vegetable oil, and considered pretty safe.

Also known as soap.

-Chuck Harris