spraying your electrical connections with good contact cleaner will help remove moisture and help clean them
using WD40, s stated also work, ONLY draw back is if you work in dusty environments, the WD40 will collect dust/dirt till it dries good
but also keep in mind that switches can also loose connection when there clips don;t hold them tightly together, which can happen over time from vibrations
so some times you need to really check connections for both clean terminals and a tight fit on plugs and connections
and if you have water in connections , as it freezes ti can push thing apart!, if they get exposed to water, not a bad idea to clean and again add dielectric grease to help keep water out!
using WD40, s stated also work, ONLY draw back is if you work in dusty environments, the WD40 will collect dust/dirt till it dries good
but also keep in mind that switches can also loose connection when there clips don;t hold them tightly together, which can happen over time from vibrations
so some times you need to really check connections for both clean terminals and a tight fit on plugs and connections
and if you have water in connections , as it freezes ti can push thing apart!, if they get exposed to water, not a bad idea to clean and again add dielectric grease to help keep water out!