Replacing Radiator, should I replace it THEN do an engine radiator flush

Right I got the directions no problem there I guess really all I'm asking is will using this Prestone be enough to clean out the engine in preparation for putting in my new radiator
Take some water with you. You dont need a hose to flush it . Just follow the instructions.
I guess you dont know if its enough until you try. Maybe do it twice. I dont know.