cleaning charging port

This one may be more useful --> If you see a liquid-detection alert on your iPhone - Apple Support

"Tap your iPhone gently against your hand with the Lightning connector facing down to remove excess liquid."

"Here are a few things not to do:

Don’t dry your iPhone using an external heat source or compressed air.

Don't insert a foreign object, such as a cotton swab or a paper towel, into the Lightning connector."

Here's is Apple's official advice --> If your iPhone or iPod touch won't charge - Apple Support

"Remove any debris from the charging port on the bottom of your device."

>:-)