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HEPA Filter should be cleaned with a dry brush or Dry cloth only. (Do not use water/ vacuum cleaner/ blower to clean the HEPA FILTER.)
Once in 30 - 45 days the HEPA filter's outside part should be kept in sunlight, it kills any virus, bacteria, mold, fungus & vaporizes any kitchen oil, etc. trapped in the filter.
Only, the pre-filter can be washed with water and if needed with detergent. (Standard cleaning of machine can be done with a moist cloth as we do in our household equipment like TV & Fridge)
Verified by different independent research organizations: -
Adhering Bacteria: -• Kitasato Institute Medical Center and Hospital
Airborne Bacteria: -• Ishikawa Health Service Association