Baking is a new method of cleaning in which the block is heated until all the crud carburizes and turns to ash, from what I've seen it does a good job and leaves only a little residue after. A shot with the air hose and parts look like fresh cast.
Any method works fine just remember cleanliness is next to godliness.
“She may not look like much, but she's got it where it counts, kid. I've made a lot of special modifications myself.”
— Han Solo