Yes, you can do your laundry while on board. All cruise lines do offer laundry service with a fee where the crew will do the laundry for you. Remember, those fees are not cheap! I would just recommend choosing the self service laundry facilities. If you want to do it yourself, make sure to take some Tide pods and your own fabric softener or else bring a few quarters with you.
The launderette room has washers, dryers, irons, and a vending machine for soap, bleach, and softeners. And costs $1.00 each!
There are 3 washers, 3 dryers, and 1 iron and ironing board in each launderette. The cost is $3.00 per washer load and $3.00 per dryer load. To think about it, it's still not as bad as the valet service price. The valet service will charge you per item, and that's not good news...lol!