cleaning up the slant six head

Thanks for your time and the pictures, interesting stuff, above my paygrade but interesting nonetheless.

My plans are this weekend to begin the soak and get the head cleaned up, I called a local machine shop and they want 50 bucks to clean it and 15 to magnaflux it. I can deal with the 15 but the 50 seems kinda steep.

After looking on-line and talking with a fellow car nut I have decided to try either Coke or white vinegar and see what happens.

My friend claims that a formula of water, powder laundry soap and one other ingredient that slips my mind will have it spotless in a week.

Id like to try the Coke so assuming the dollar store has it on their shelf I may start with that.

Will be posting pictures as I go. If there are any better suggestions please chime in.