How to clean a copper atomizer cap? (TOBH)

[VapinSweetZ]

I have a copper TOBH by Tobeco, only 2 weeks old and already got really dirty. What's the best way to clean it back to its original color?

Thanks!

 

[VapinSweetZ]

Never mind just found somewhere about lemon and salt, I used lemon juice and it works like a charm.