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I don't know how nuts like Howie Mandel do it

From a sanitary perspective, bathroom design is impossibly stupid. Especially public bathrooms. Here is an outline of the typical visit:

  1. Open/close an outer door and, on occasion, an inner door
  2. Open/close a stall door (optional)
  3. Unfasten various buttons/zippers/buckles/straps
  4. Pull/push clothing up/down/to the side
  5. DO YOUR DIRTY, DIRTY BUSINESS
  6. Pull/push clothing up/down/to the side
  7. Fasten various buttons/zippers/buckles/straps
  8. Flush (may optionally be done earlier/automatically)
  9. Open stall door (optional)
  10. Wash/dry your hands
  11. Open the inner/outer door(s)

Even neglecting the fact that some other people might not wash their hands you still have 2-4 steps of touching things while UNCLEAN. And they're not just things in the bathroom, but things on your person that you leave the bathroom with! In the interest of improving the situation, lets take a look at the worst pieces of the puzzle from a stupid perspective.

Doors
How dirty they get depends a great deal on how much they have to be manipulated. If you have to twist knobs and locks, it's going to result in a lot more contact than a simple push door would. Also in question is how clean you can trust hands to be when entering and exiting the bathroom. If you can't trust everyone to wash their hands, I think most people would say the outside mechanisms are cleaner than the inside mechanisms.
Clothing, and yet not
Seems like too big a task to "redesign" how we undress, so we have to manipulate another part of the equation. The most obvious way is to introduce a way to wash up before we put everything back in place. This can be accomplished by using a toilet sink, although there doesn't seem to be a good urinal equivalent at this time.

So, for the most part, problem solved. Here is the updated procedure, which only required the most modest of changes:

  1. Pull open the bathroom door(s), which close on their own
  2. Close a stall door (optional)
  3. Unfasten various buttons/zippers/buckles/straps
  4. Pull/push clothing up/down/to the side
  5. DO YOUR DIRTY, DIRTY BUSINESS
  6. Wash/dry your hands
  7. Pull/push clothing up/down/to the side
  8. Fasten various buttons/zippers/buckles/straps
  9. Flush (may optionally be done earlier/automatically)
  10. Open stall door (optional) with a push mechanism that can (ideally) be operated by foot
  11. Push open the inner/outer door(s), also (ideally) by foot

Of course, as far as dealing with the non-hand washers who are also off touching other things around the workplace, some parts are left as an exercise to the reader.