Don't use any metal tools to clean the port, as you risk damaging the port.

Insert the head of a brush, like a dry toothbrush, into the charging port.

Gently turn the brush in small circles to break up any clumped debris.

Remove the brush and use a dust blower to blow out any debris.

If any debris is stuck, reinsert the brush and rotate it to let the hairs "scoop" out any debris.

Plug in your iPhone and check if it's charging. If it's still not charging, move on to the next step.