Prestone Flush'n Fill Kit how to flush engine (archive)

I bought a pack of Prestone Flush'N Fill Kit which is suppose to allow me to feed water from a garden hose into the engine and have water travel through the radiator and out (thru the disconnected upper radiator hose). The kit includes a few Tee connectors of different sizes, hose clamps, back-flow preventer coupler, and a splash deflector tube. The advantage is to flush the engine coolant without removing the engine drain plugs.
The tee connector should be connected between the engine and heater. I look into the several coolant hoses between the engine and auxillary pump, and have no idea where to put the tee. Furthermore, space is cramped there.
Has anyone tried flushing the engine using a kit like this? Or is there a better way to flush the engine short of unscrewing engine drain plugs? The plug on my left engine block has been difficult to unscrew, particularly the exhaust manifold blocks the bolt partially. Thus the socket doesn't sit square on the bolt and I couldn't apply much torque before the socket slipped out. 13mm swivel socket didn't help either.
Patrick C 88/750iL/100K/US

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