Originally Posted by onebadmerc
I had had blocks cleaned by the methods I listed before I rebuilt them, but it doesn't seem like one method is better than the next. All three methods I listed, get the grease and grime off pretty good but I always have rust in the water jackets. Is there another method that machine shops use to clean blocks that will get rid of rust in the water jackets along with all the grease and grime?
A real hot tank will dissolve the rust. Unfortunately, due to environmental requirements, most shops have stopped using real hot tanks and instead use steam cleaner tanks. This gets the crud off but doesn't touch the rust.