It had some charring on the 3rd pin a few years ago, but since all the connectors are actually visible, I simply cleaned it with a rough piece of cloth, and it’

It had some charring on the 3rd pin a few years ago, but since all the connectors are actually visible, I simply cleaned it with a rough piece of cloth, and it’s back to normal. All USB plugs have their connectors on the inside, making it impossible to clean them.