Upvote:3
According to this TripAdvisor post, "regular" laundromats are very rare (aka don't exist) in Marrakesh. Residents do laundry in their own home. From how I see it, your options are to ask the hotel to do it, befriend a local to wash it, or just wash them yourself in your hotel room. If it were me, I would wash it myself in this situation.