On Mon, 18 Mar 2019 20:22:32 GMT, (Scott Lurndal)
wrote:

writes:
What are the best lubricants (not WD40) that sliding windows and patio doors?

White lithium.
NOT white lithium - it cakes and holds dirt.

Are the windows vinyl, aluminum or wood?

Generally patio doors should NOT be lubed - they run on rollers on a
track. If they get stiff it is often because of bad rollers - or dirt
buildup on the tracks due to grease buildup.

Whatever you use on windows needs to be compatible with whatever
plastics are part of the window mechanism (The solvent in some
silicone sprays can adversely affect the plastic pivots on some vinyl
windows - don't ask how I know!!!!!