For me, it would depend on what city I am in, available hotel amenities and if it is a work trip or personal trip.
If I am on a work trip and it is a project where there is little personal time then I am sending it out to be done, period.
If it is a personal trip, I am likely to send it out to a laundry service also unless there is a convenient laundry in the hotel I am staying at or in some instances I can find a hotel with laundry machine in the room. The last option is mostly serviced apartments in Asia.
I typically try to avoid the hotel laundry service for cost reasons, for my employers and my sake.
