To clarify; I have not yet sprayed anything into the dial mechanism.

This used to be a light switch, but my son kept leaving it on. So I swapped it out for one of these dials about 2 years ago. Now it seems to be getting stuck around the 10-min mark and being left on all day.

I'd prefer not to replace this dial again; the house is old and the wiring in that receptacle was already pretty hard to work with. But I mean I'm not going to burn my house down in an effort to save myself 10 minutes and $10.

Is it safe to use a silicone based spray on it?