What if I forget its cleaning day and dont pick up clutter/dishes, etc.?
If the clutter is minimal the housecleaner may stay and do what they can. However, youll need to be more flexible with the end result. They may not be able to clean at all if they feel they will be spending too much time picking up (Most services will expect full payment in this event). You should discuss this ahead of time if you feel it may be a likely occurrence.