Pretty much any auto machine shop can clean and magnaflux your parts. If you are getting machine work done you may want to be a little picky. This outfit in Chico got a good review from someone with an AD truck as their avatar.
http://www.yelp.com/biz/b-and-b-machine-shop-chico

I have used machine shops in Redding but prefer a small very well run shop in Red Bluff- Buds. Does excellent work.