Neoval Oil Spray (made in Switzerland) is, according to my experience,
much cleaner to use than WD40.  It never gets sticky even after a few
years, dust will not stick to the treated surface.  Read what they say
at  http://www.neoval.ch/neoval-e/produkte/oil_spray.shtml

Also for milling, at the lathe for easier cutting, etc.  For cleaning
and protecting guns.

All moving parts on my 1923 Pianola are treated with Neoval and this
for over 20 years without any problems.

Sincerely
Hans J. Schweizer
Aarburg, Switzerland