Silicone based products are really not a good thing, at least thats what
some say. However sometimes a silicone grease is used to
protect connections. Silicone sprays were common 30 years ago.
I don't recall any of the more common recommended sprays having
silicone. I see mixed recommendations of lubing relays.
Some say no, but I do.

greg

Silicone based cleaners leave a residue that protects against friction but
tends to insulate. You have to break through the film in order to even have
contact. I have found them useful for connectors that see lots of use, such
as Notebooks, but I usually have to wash them with Isopropyl to remove most
of what I put on.

There is no point in lubing relays. Any residue will increase the
likelihood of burning of the contacts. They should be cleaned and burnished
with a non-residue cleaner and as minimally abrasive tool as possible. Bond
paper strips will often suffice.

Isopropyl Alcohol at 90% or better is clean, leaves no residue, won't harm
most plastics and is the only recommended cleaner for many switches and
contacts. Do not use less than 90% as there will be risk of moisture
damage.