Where is the plug to drain coolant on my 2006 Ford Focus?

I'm quite sure k-seal has caused a blockage in my cooling system somewhere, as since using it the coolant level has been erratic, bottle empty one day, then higher the next e.t.c.

I want to flush old water out ( only use water) but where will I find the drain plug?

During flushing coolant, is it just the plug I remove or do I also have to disconnect radiator hoses too?

thanks

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