Ah ok, I see no reason to drain the antifreeze afterwards if you are pulling the drain plugs to evacuate the raw water in the system first.
As much crud as I have seen year over year coming out of my block drains I would not want to not pull them periodically for that reason alone.
I do in the spring fire up the boat on the muffs in the driveway to flush out all the A/F that was left in the engine over the winter time.
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