I'm with Farmwithjunk on this one.
That's why I flushed my radiator out ... to get rid of as much dirt, rust etc. that builds up on the inside walls of your cooling system. In the long run, being cleaned out like that has to allow the cooling system to perform better. Somehow it's got to have a positive effect on your engine life too.
For example, when I drained out the old coolant it looked perfect and I thought, "Why am I doing this, the old stuff looks great?" But when I flushed the system, look what came out. Just follow the instructions on the bottle.
