There's usually a laundry special about halfway through a cruise. Depending on the line, it's $15.00-$20.00 for all you can "stuff" into the laundry bag they provide. It's not a very big bag, but if you roll the clothes and "squish" the air out you can get quite a bit in the bag !
In case you want to take an hour or so to do your own laundry (and I know lots of people don't ), from the Carnival website:
Can I wash my clothes while on board?
Each ship has at least 2 self-service launderettes located on the stateroom decks.
There are two or three washers and dryers, and one iron and ironing board in each launderette. The cost is $2.00 per washer load and $2.00 per dryer load. Vending machines dispense small boxes of detergent and water softener at $1.00 per box.
Note: Due to local environmental requirements, the washing machines in the guest' launderette will be closed in port, per each ports specific requirements; the dryers and irons will be available for guest use
Have a wonderful cruise!
"A truly happy person is one who can enjoy the scenery on a detour."