Well, I've read about it. I've heard about it on YouTube. But until today, I've never in all my years of RVing actually seen anyone do it. I saw someone stick their sewer hose onto the city water faucet to clean it out after dumping. He didn't just hold it under the flowing water inches away, but actually tucked the end between the faucet and post to run the water through. Why? Why? No regard for the next person that is going to use that faucet. I've heard others use bleach wipes to clean the faucet before they hook up their fresh water hose because you never know what the previous person used it for, but I never got into that habit. No, it didn't kill me obviously, but being a bit of a germaphobe, I'll be starting a new habit now. It's one of the most common-senseless things I've witnessed yet in camping. Next to the multitude of people who will walk their dogs through someone else's campsite to do their duty behind someone else's camper rather than in their own site; and won't pick it up. Rant complete...