Separate cost....logistical issues with the dumpster pick up. Usually when a manager at a fast food place tells you that the garbage truck arrives at 7:00 am. The reality is between the hours of 6:00 am - 8:00 am (unpredictable). To add to the problem, there is usually 4-6 bags of trash from the night shift ready to be thrown into the dumpster right after it is emptied. The morning shift could care less if you are there to clean the inside.
The dumpster itself is not the clients property...it belongs to the waste management company. The waste management company would be ultimately responsible for getting them clean......and this usually happens at their yard vs. onsite!