No aircraft flight manual I've seen mentions hygiene procedures even for known infectious diseases, for this one you're on your own
The general instructions for prevention of Covid are wash well with soap and water, which seems to correspond really well to what Cessna says to clean their interiors, so it seems to me that following the instructions (POH) would be very appropriate.
Otherwise, nearly any cleaning product I have seen has instructions which include the words "test in an inconspicuous area before applying...". So, between that wise general premise, and not having permission to wipe something unproven, uninstructed around someone else's plane, I think the wiper bears some responsibility for damage.