Cooling system flush and refill

[fazersharp]

economical - water from a hose to flush it then refil it with pink coolant

when you say with a hosepipe do you just mean tap water without any rad stuff in it. Or do you mean stick the hose in the rad and let it run out the drain bolt.
Wouldn't that just flush out a very small part of the engine and bypass most of it that would of otherwise been got to on being pumped around everywhere.