Cringe. Please use contact cleaner for electronics (Servisol is a good brand). WD40 may well eat plastic & rubber seals (although nitrile rubber, eg. o-rings, s

Cringe. Please use contact cleaner for electronics (Servisol is a good brand). WD40 may well eat plastic & rubber seals (although nitrile rubber, eg. o-rings, should be safe). It's a light oil spray and water displacer. It's not a substitute for proper lubrication - it will wash grease & oil OUT of bearings for example. For brass hinges, locks etc. use graphite dust (soft pencil lead if you have nothing else, but graphite is cheap). Oil will attract dust and other crap and make the problem worse over time.