Anyone with experience using DeOxit to clean iPhone charger port?

It is not advisable to spray anything into the port, as it could get into the inside of the phone. The pressure could also force and non-soluble dirt further in. See IdrisSeabright's advice on cleaning the port. The contacts are gold plated, and should not need any cleaning.

Here are Apple's recommendations for cleaning your Apple product:

How to clean your Apple products - Apple Support

If you think that there's something stuck in the port, use a magnifier and a bright light. Use a non-conductive tool such as the stick from a cotton swap to carefully remove what you find.