Disassembled my kailh cream switches (they are made of POM).
Poured isopropyl into a small container.
Put switches into the container.
Shook it for 20 seconds.
Removed switches, let it dry.
Poured an engine oil 10w in another tiny container.
Put springs in that oil.
Removed springs from oil.
Put them on a paper towel, let excess of oil to drain.
Assembled switches.

Why pay more?