Oil Crud

I've got alow mileage engine that has been sitting for a couple of years. Is there a product I can use to purge the old oil & crud from the insides. Someone said something about ATF helping remove sludge.

Sea Foam. Get it at any parts store, follow the directions. You can use it 1/3 into the intake via a vacuum line, 1/3 into the crankcase and 1/3 into your gas tank. Works wonders.