@Sydney150 Absolutely you have to present new guests with completely empty garbage bins. It could make the difference between a 5*review and a 4*, with markdown for cleanliness. And I beg to differ- a used tissue someone blew their nose in is unpleasant and offensive for the next guest to spot.
The thing about guests is that if something catches their eye that annoys them, they can start looking around and feel critical about other things they might not otherwise notice or normally care about. So a few tissues in the garbage can left over from another guest can set them on a quest, looking for some stray hair or a crumb you might have missed.
As I hate creating plastic garbage, the only bin I put a bag in is the kitchen bin. The others I just wash out or wipe with a bleach or Lysol wipe if it's basically clean.