Hey guys, I'm in the process of doing a top end and valve restore on my airhead. While the headers are off, I thought it was a good time to give them much needed attention. I'd like to polish up my existing headers. The cross over pipe is severely rusted (no holes, though) and there is a dent about 1 inch long and an 1/8 wide on the front left header. Image to come. My question is this: What do you guys recommend doing for cleaning up headers? I thought about aluminum foil and water to start, followed by naval jelly. How about the dent? Should I do the old, fill it with water and freeze it to push out the dent? Good idea/bad idea? Take it to a shop? Thanks!