Dielectric grease is good for non arcing contacts like in plugs, connections ..... but it's silicone based and if used in a arcing contact situation, like switch contacts ....
.... the high momentary temps will cause it to build a black coating on the contacts that will in time, need to be cleaned off.
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I've had problems with window switches of my '07 FX4 PU and when opened up, found such a black coating on the contacts of the problem children.
I cleaned it off and used some NO-OX-ID grease on them instead .... not silicone based, no build up either.
This is a link for a big 8 oz tube, you can get smaller portions at Amazon or Ebay, and all over the net. Tube or tub or small envelopes. . https://www.amazon.com/gp/product/B0...A1EZ2V2AKS0VVR
It's even available in spray .... search Amazon.
"A little dab will do ya".