Cleaning used short block

RustyRatRod said
Hot soapy water and a pressure washer. Nothin else works as well.

Did that on a Cadillac small V8 once. The oil drain back holes had clogged and a rod wouldn't go down them.

So removed the valve covers and oil drain plug and and blew the holes clean along with the rest of the top end.

After letting it drip for about an hour put the engine back together with fresh oil and filter and it ran the best it had in 2 years of daily driving.

But still glad it wasn't my car