Yup! Some accommodations will have laundry facilities available. If not, then your Tour Director can help you get to a laundromat.
We also recommend you bring lightweight clothing that can easily be hand-washed, and pack some extra detergent packets just in case you end up needing to wash something in a pinch.
PRO TIP: Pack dryer sheets with your clothes to keep everything smelling fresh and don't forget a bag for dirty laundry!