You would be surprised what DeOxit D100 does for tight fitting but slight heating of blade type conventional breakers under load. Too many times I have treated the blades and the heat slumped to normal. This is no gimmick fix.
Same for tubular aluminum barrel soldering guns -- Weller
Remove tip. Scratch up the inside of the aluminum barrel. SOLDER the tip ends that fit into the barrels. Saturate with D100 then instead of lasting so many months the tips have lasted me for YEARS without having to remove them and clean the aluminum barrel again.