Puddin' Man wrote:
Suppose I need an all-purpose dielectric grease for everything
from spark plugs to stereo switches, etc. Price/availability?

Lubriplate is widely available and not expensive at all.

https://www.brownells.com/aspx/ns/st...tle=LUBRIPLATE
for one source found randomly on a search engine.

--
If you really believe carbon dioxide causes global warming,
you should stop exhaling.