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I'm wanting to have an polished or possibly oil can finish on my putter, but first I need to remove the current finish. It has a black oxide finish now. I know I could just sand it off, but it would be difficult to to get into the cavity and inside the milling marks. It is a anser style milled head with a black oxide finish that I don't like. What suggestions do you have to get this off?

If it's a true oxide finish, paint strippers won't work. It'll take a chemical bath to remove. I know this because one of the companies I worked for did gold, and black oxide finishes on Aluminum. The removal process is long, and the chemicals are toxic. You'll have to find a company that can remove the oxide finish for you.

Removal of Black Oxide finish be either (1) mechanical - sand or bead blasting (2) chemical bath.
If it's a hot oxide you can use a 25-50% Hydrochloric acid pickle. If it's one of those room temperature oxide coatings it's a little more difficult. For those we have to use a mixture of Sodium Cyanide and Sodium Hydroxide at 125F. I wouldn't recommend this for you if you don't already have a plating line that uses Cyanide. You can tell right away by dipping a part in the Hydrochloric acid. If it comes right off you're ok. If it stays black then start blasting(sand or glass bead). Note: If it has an oil film you should degrease it first in some type of cleaner...it keeps your acid lasting longer. The parts will rust very quickly once they're out of the acid so a rust preventative is a good idea.

Have someone do the job for you, it's much easier and safer.

"The Works" - Toilet Bowl Cleaner from Walmart. I hear that stuff works pretty good depending on the putter. My Cameron had like a gun metal finish and I just did a Coke bath with it for a couple days. But if it is a real oxide finish than definitely take the advice of release and lowof.

Most all machine shops will have a "bead blast" cabinet. This will remove all the oxide from inside the small markings and any cavities. This will leave you with a dull surface, which you may or may not like. I happen to perfer a dull look over a shiney one, so if it was my putter, I'd bead blast it.