You will see many rows of "blue rooms" on Cycle Oregon.  Sometimes in camp, sometimes at a "wide spot in the road", while you are cycling.

This is a washing station with a water bottle filling pipe off to the right.

Each door of a shower truck leads to a changing area with an adjacent row of shower stalls.

Sinks and mirrors are available next to each shower truck.

A do-it-yourself laundry area is also available.  Wash your clothes in the plastic bins and dump the dirty water into the laundry tub where it runs into the gray water collecting bags.