Thread: Electrolytic rust removal for engine block

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I got my 218 back from the engine shop and they soaked it in what ever they use to clean up the rust. It is nasty enough that he said I will need new cam bushings afterwards. It still has a heavy build up in the bottom of the water jackets, enough for a hammer and screwdriver and I would like it out of there. I would like to use electrolytic to try to remove it but does it work well with hard rust built up that heavy? All the machine work has been done to the block that shouldn't be an issue should it? I know hindsight it is 20/20.