yeah free.
In trip.com, look for those that states "Guest Laundry" or smth like that
How it works:
1. Put your clothes into the washer, select the washing method. Detergent is always provided (either auto-dispense or pour yourself).
2. After washing/ spinning, take it out and put into the dryer yourself
3. After drying, take it out and that's it
If you forget to remove from the washer/ dryer, someone will take it out for you and place them in baskets/ bags, since you're "hogging" the machines