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I flushed it out by putting 2 tablespoons of dishwashing detergent in and running it for 4 hours on a little trip, let it cool a bit then put in filtered water and flushed this way about 3 or 4 times until it FINALLY came out clear. Then filled with my preferred coolant for my diesel engines...

I've had the same deal going on....flush and flush and flush through the drain valve. I've noticed rust every time and continue to attack it; have decided flushing out the pitiful little drain valve on the passenger side is inadequate; have to pull a hose to do this right, but which one? You...