Back when I played yard dog for a while we had a gas free company come in to prep an engine room to swap from a set of ALCO 16 or 20’s to a set of 3516 D’s.
These guys brought in steam generators and the whole 9 yards, they were more expensive than the pressure washer guys we usually used but in certain applications saved money as the steam really seemed to help cut down on the oil seeping out of the steel in the bilges after the initial gas free and cut down on re-cleaning.
Boat had been built in 1952 and had been running the whole time.
Encountered plenty of other fascinating issues on that project though, including that burning diesel for 50 years through the same exhaust will cause it to pick up enough radiation to set off the scrap metal guys detectors.
But this is probably beyond the scope of OP’s question.
I’d be concerned mostly about releasing magic blue smoke from things that should be retaining it. That’s probably a operator issue as much as anything.