The First Clean Is Usually a Deep Clean
Almost every new client starts with a deep clean, and there is a good reason. A maintenance clean keeps a house that is already at a standard sitting at that standard. It is not designed to catch up on soap scum that has been building for two years or dust on top of the door frames.
The deep clean resets the house. After that, the recurring visits hold it there, and they take less time, which is why the recurring price is lower than the first one.