How should I clean and store my air purifier?
Clean the air purifier at least once every 3 months and before extended storage using only a dry cloth to wipe the external surfaces—do not use water, wax polish, or any chemical solution. If the air purifier will not be used for more than 30 days, remove the HEPA filters and wrap them in an airtight plastic bag, and remove the Odor Reducing Pre-filter and place it in an airtight plastic bag.
From the official Honeywell HPA8350 Air Purifier manual, page 6
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