Hello, what is the best way to get rid of/prevent cowbell rust. Mine has picked up some on it's inside

They are so much better with rust and some different amoebas living inside. Amoebas add tone. =p

If you want to remove the rust use Naval Jelly (available at your local hardware stores).  It removes the rust with little or no work at all.

In the past I have used a brake drum mounted on a stand.  It was ate up with rust but sounded great.  For years I went around hitting everything I came across just to hear the sound it made when struck.  It was a fun way to pass the time and I also found some good sounds too!  

For awhile i had a crow bar hanging towards the back of my drumset that i would play like a giant triangle, had a really nice resonance to it, we recorded it it sounded awsome. I think im going to pull that thing out.

I always bury my cowbells for six months before using them.  

I got a Rock Ridge Rider for nine bucks on eBay. I guess no one else wanted it because it was rusty and pitted. When I got it, I used it for a couple weeks, then sanded it down to bare metal inside and out, taped over the plastic bar, and carefully spray painted it with Rustoleum. Looks brand new, and sounds the same to me as it did rusty.