You might want to talk to the owner(s) of the laundry business before you take these types of items in.
Our local mat (I don't use it but I called and asked after reading this!) does not allow diapers to be washed there. It's about health department compliance. Yes, clothes have sweat and dirt on them, but most people's clothing doesn't have urine or fecal matter attached. There is no way they can be 100% sure that the machines are clean enough after having body waste in them. Risks of things like e-coli are there. Sure, the risk is small, but it IS there. And, yes, the risk is there whether there are diapers being cleaned or not. They are just covering their backsides as regards health and safety and liability.
Nor do they allow non-commercial cleaners in their machines (ie baking soda or other homemade cleaners). This is for safety and maintenance reasons.
Check with them before you use their equipment.