Is there an easy way to degrease and de rust a K frame?

I had a hot tank. I still have access to it, but I need to hook up the electric to it. Oven cleaner and pressure washer will do a decent job on the outside, but it has to soak to get the inside. You'll never get the seams completely cleaned out without fire. I recently had one blasted at a local powder coater. Came out real nice.