I don't know how high your cast is...but when I was a kid, I broke my leg and had a cast from toes to just below my knee.

When I had a bath, I would just hang the one leg outside the tub.

For a shower - how about heavy plastic and duct tape to cover the cast?

I remember my surgery two years ago...I went in hosp Monday and showered Thursday morning...and it felt GREAT! So I understand how you are feeling in the clean dept!

I hope you find a way to freshen up soon, for your own sake.