WD stands for water displacement so it doesn't sound like it's out of the realm of possibility, but Unit 5302 pointed out that running some water through the engine is good for removing carbon deposits. If a car is dumped in the river while still running it may actually clean the inside of the engine and the WD-40 does a good job of removing the water from the engine after that. Why not try that? Dump the car in the river while running and then flush it with WD-40.
You'd probably be better off running Marvel Mystery Oil through the engine while it's running.
------------------
351W 89 Mustang GT Convertible