How do I handle winterization when storing my washer?

Put 1 quart of R.V.-type antifreeze in the drum, run a Drain/Spin cycle, unplug or disconnect power and shut off water faucets. Before reusing, flush pipes, reconnect hoses to faucets, plug back in and run Quick Wash with recommended amount of HE detergent to clean out antifreeze. (Page 22)

From the official Whirlpool Duet Front Load Washer manual, page 22

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