Don't use your mouth to blow into your charging port, as the moisture from your breath can damage the contacts.

Point the tip of a dust blower at one corner of the charging port.

This gives room for any debris to eject out of the charging port.

Blow a few puffs of air into the charging port.

Plug in your iPhone to check if it charges and if the charger is fully seated.

If your iPhone isn't charging or seats properly, unplug it and repeat the blowing process.

If your iPhone still doesn't charge or sits properly after multiple repetitions, move to the next step.