Andrew Herrick wrote:
Well ... I suppose it depends on your definition of acceptable hygiene :p My wife and I camped out of the back of a Ford Expedition SUV for nine months straight. We used cheap soft plastic plates, the sort you purchase for $3 at Wal-Mart. We found that a damp paper towel and abrasive pad cleaned anything except greasy plates. For that, we either used good ol' soap and water or a food-safe citrus-based degreaser. Probably not the most sanitary solution ... but we never got sick
and we could stretch a gallon of water for days.
Not many nasties survive being dry very long, so just thorough drying will go a long way. UV helps too, so theoretically you can dip 'em in ditchwater and leave them out in the sun to drain/dry and you're good.
However, the soft plastic gives a little cause for pause in case it gets scratches that hold moisture and hence bacteria when the rest of it's dry still.
Now if you're using some kind of tin plate or ceramic, you could rig a rack that's a fire reflector, and they'll probably get hot enough that it's practically autoclave sterile.
Jack of all trades, Doctor of rocket surgery and fellow of the noble college of shadetree meddlers. "in argentum tenax vinculum speramus"