Here we go again. Everybody wants to try the latest trick. I have a Better Engineering block washing cabinet. (That doesn't work because it only cleans the outside.) I have a drum of Evap-o-rust. (That doesn't work because it won't remove paint or grease.) I have and ultrasonic tank. (I doubt that it would work and I sure don't want to put a greasy block in there.) Blasting doesn't work because it won't get the rust out of the water jackets or the sludge out of the oil galleys. Baking might do something but I want my block clean everywhere. Muratic acid will work in the water jackets if you leave the core plugs in and block everything off but I would sure rinse with something other than water to neutralize. (Possibly baking soda.) The only thing that works for real is a 50 year old caustic hot tank. Not every shop can do this now-a-days, but find a shop that can. It is the only one step process that will get your block perfectly clean.