How do I store the pressure washer for winter?
Always store the pressure washer indoors in a dry, covered area where the temperature will not fall below 32ºF (0ºC), as the pump is susceptible to permanent damage if it freezes. Always empty water from all hoses, the pump, and the detergent bottle before storing. If you must store in a location where temperatures fall below freezing, disconnect all water connections, turn on the machine for a few seconds until remaining water exits, and consider using a pump protector or non-corrosive anti-freeze.
From the official Sun Joe Washing Machine manual, page 12
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