Another good option silicone (gel or spray).
Usually is already around the workshop relatively cheap. Don't "stick" or get sticky.
Most important dust/dirt don't stick to it. :Egyptian:
Just adding my 2 cents regarding cleaning electrical contacts. :whistling: :whistling:
Vinegar work really well but sometimes because it's a liquid you need a container (jar/plastic bag).
So here's another tip:
MUSTARD. :Egyptian: being a gel or past, solve the container issue. Everything...