Cleaning patina from the inside of a copper mod

[Robbahh]

I have a copper 4nine and the inside is starting to get a bad patina along with the threads. What is the best way to go about cleaning the inside of the mod to remove the patina?

 

[steved5600]

The corrosion can be removed with white vinegar and a tooth brush. To keep it from happening again you can use something like Noalox® Anti-oxidant Compound.

 

[DavidOck]

But don't bother with the patina that's NOT on the threads, as there it won't affect anything. And you'll be the only one who knows it's there