Remove Freeze Plugs When Winterizing?

My engines have been fine in MN forever, with the "green stuff" left in the block, and flushing the raw water side with the "pink stuff" (pure since it's pre-diluted) by pouring in the water strainers.

There's usually a VERY cold week or two in MN but since - as noted above - we are not counting wind chill, anything that protects to -30 will be fine.
 
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