04-07-2019, 10:04 PM
You need something that will dissolve old dried up oil, grease, grime or whatever else gets into the button assembly. I start out with...believe it or not... Gumout carb / choke / parts cleaner. Spray the controls good with that and work each button. It evaporates quickly which is good. Then you can follow up with contact cleaner and finally some WD-40 for lube.
Greg V.
West Bend, WI
Member WARCI.org