I always run my devices through a cycle in the ultrasonic once I've polished them.
Also the brand I use for the Copper Cream and Brass Cream is Wrights, it's formulated for cookware and is non toxic. I won't use any petroleum based cleaners for my Vape gear.
Heck I've even started using the Copper Cream to clean up my coils, give them a good rinsing and then run them through a cycle in the Ultrasonic. I really, really does an excellent job.
That should help, use a high concentration of Vinager and if you've got a crockpot let it sit in the hot solution for an hour.