In article ,
Grant Erwin wrote:

I think you guys are absolutely bonkers on this one. If they underbuilt
plugs so they got hot and started a fire, they would get their asses sued off.

Probably true. But they certainly do underbuild them so they get hot at
full load, based on touching plugs that have been run at full load for
several hours or longer. Not flaming, but not cool, either. And that
means that they are adding voltage drop & power loss you could do
without to the circuit. ie, if, as will tend to be the case on a cost &
lawyer-driven basis, the plug is just good enough to not catch fire at
full load, it can still get plenty hot.

Cleaning the blades on the plug can also help, depending how cruddy
those are. Cleaning the socket contacts is a bit trickier, and can have
detrimental side effects.