Does anyone know of shower memberships in downtown DC? In other words, if I am commuting in fromt he suburbs, and don't have a shower, are there gyms or offices that have memebrships where I pay per month and can shower?

Here is my second question, if I had an idea for how to set something like this up (if it doesn't already exist), how much would you expect to pay for such a service?

Ideally, I would like to go the path of leasst resistance, but if it doesn't exist, I may need to get something going.