Toggle switch cleaning?


I have a preamp with a toggle switch for changing phase. Sometimes I lose the left channel on switching. Is this something that can be cleaned at home, simply and safely? Or can this be worn out?Thanks. Pete
ptss
If there is corrosion, maybe but WD-40 tends to get gummy and attract dust as it ages. Could be a short term fix w long term consequences. Why not use contact cleaner?