To some employees, janitorial work is just a job. They know they have to empty the trash, do some dusting, clean the kitchen and bathrooms and vacuum the floor. But are they really seeing the "big picture" when they're finished cleaning?
When your customers come to work in the morning, the first thing they see is the front door. As they approach the door, they're also observing the surroundings. What are they seeing? Dirt and debris along the corners and edges of the entry, and on the window sills? Cobwebs around the door frame? What about the door itself - is it sparkling clean and free of fingerprints?
Now they enter the office, where there is usually a reception area. Perhaps there are some chairs and a coffee table with brochures and magazines. Are the magazines neatly arranged and the brochures tucked in their holder? Is the entry mat vacuumed, free of sand and leaves?
Your customers are paying attention to the details, and if the details aren't taken care of, they assume the rest of the cleaning must be sub-par too. When training your employees, make sure they pay attention to the details that are important to your customer and that they see the office through your customers' eyes.