Great customer service to is the number one rule, That the customer is  always right no matter what.  It is a rule that I have practiced my years being in the janitorial business. It is our job to serve the customer, and how do we do this? By always having a smile on our face greeting them in a professional way and solving there issues in a timely fashion. Being sympathetic to their needs, even when they are having a bad day. Always checking on the customer and making sure that we as a company are doing our job and doing it in a timely fashion. That's what good Customer Service is to me.