As I've said before, I hit my upper control arm bushings about once a
year with silicone spray to keep the squeaking away.  I've done this for
a number of years without any apparent detriment.

My present can was purchased at a True Value hardware store and is
"Snap" branded.  They say (about themselves, of course) "Stops squeaks &
sticking". "For use on autos & boats, home, garden, workshop".

Under Automotive Use they say:

"Will stop freezing of trunk lids, doors, and locks, it will also
waterproof ignition systems, silence door hinges, lubricate rubber
mountings and repel water".

Works for me.

Mikel
Houlton, Maine
'84 GL 7 pass
'85 GL Westy