Laundry on Crystal
 

I read Silversea's butlers do the laundry for guests at no extra cost. Does Crystal offer that service, even if I have to pay extra for it? I want to go on a two-week cruise combined with a tour and can't put three weeks of clothes in a suitcase. Because I will be on vacation, I do not want to spend time doing the laundry myself while on board.

You have to pay for it - unless you have 25 cruises, then you qualify for free laundry under the loyalty program:

Cruise Line Loyalty Programs - Compare cruise line reward programs and repeat passenger benefits