We sailed this 5 day cruise on the Radiance in March. Things must have really changed. It was a very, very quiet ship. I guess when school is out it gets more like your experience.
They will have laundry detergent for sale. I have also read that some people bring a laundry pod and a dryer sheet with them. If you do this, I would make sure it is stored in a container that will prevent it from being squished.