How do I clean my Apple charging port???

Use a small flashlight and a wooden toothpick to very carefully and very gently remove any lint or debris from the port. A can of compressed air will help as well.

If no luck, try another charger or charger cable to make sure that the issue is with the port. If the port is not functioning, it's time to make an appointment at the Apple Store or authorized Apple Service shop to let them investigate.

I find the dental picks with the brushes on the end are very useful. The brand I like is the "GUM Advanced Soft Picks".

Glad it helped!