Although unusual, if it is that important to use biodegradable detergent, I would just provide tenants with that kind of detergent every month. 

As a Host, do you supply cleaning supplies for your cleaner (bleach, soap, detergent, etc)?

Other than that, you do not want to provide these appliances because people are notoriously hard on both, overstuffing them with clothes, using too much detergent, etc.When we rehab units we normally make all provisions that make it easy for the tenant to bring their own so that there's no reason for us to provide a washer or dryer. 

TSP was not available as a residential cleaning agent in Greece, so I made due with soap, all-purpose cleaners, laundry detergent, and scouring pads.

Laundry detergent: clean clothes and time back with family.  

We have them simplified on our listing but this is more detailed:1.The property is located at: 2.The property is furnished and includes:Dishwasher, washer, dryer, refrigerator, stove, microwave, small appliances such as a toaster and coffeemaker, linens and towels, dishes/glasses/pots/pants/utensils, towels and bedlinen, TVs, treadmill, internet access and firewood. 3.Please bring your own personal bathroom amenities are not included. 4.We request you use septic safe toilet paper which is provided and the provided dishwashing detergent and laundry detergent which is also safe for septic systems. 5.Rental Party:  The guest is responsible for the behavior of all members in his/her party. 6.Maximum Occupancy:The maximum number of guests is limited to 8 adults.

If a renter left cheap laundry detergent behind, I use it to clean oil spills on concrete and replace the detergent with good stuff.

Hotels (or gyms) are not using cheap towels or cheap detergent and they use high temperature commercial washers.

Bath towels would go, along with soap, toilet paper, paper towels, laundry detergent, etc. 

They also provide and restock shampoo/cond. for guest use and all soaps, detergents, TP, garbage bags, etc... for the home.You can get more info at city of seaside website and talk to Debbie at City Planning to get filled in on all the rules.