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Contact cleaner is good but it dries out too fast unless you can spray it directly onto the conacts. We've been using this method in electrical substations for 20+ years.
It could possibly be dirty contacts in the switch. Spray wd40 or another penetrating lube into the opening around the switch and operate it a dozen or so times to wash away any contaminants.
If you have greased bearings on anything, never use an aerosol type oil. The petroleum in the spray will eat the oil in the grease and leave only a soap substance. The chemical reaction with the propane or butane used as the propellant will solidify the soap.
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