i always send thank you cards when the job is done.
          

We are into janitorial services and it has given us great pleasure to give a free gift here and there as well as clean an area or spot that was never a part of the contract. Going above and beyond is what we do, cleaning corning and not cutting them is what we give.  Our aim is always to make the customer feel that they are the best customer we have ever had.
          

After a bathroom remodel for a particularly "neat freak" customer, I hired a cleaning lady and told the customer to use her anyway she likes for 8 hours.
          

I own a carpet cleaning company and I give shoe covers to the children at the home. They like them and they wear them over their shoes so that they can mimick me. It helps to protect the carpets until they are dry and kids have fun with them. I also clean the front entry door mat as a courtesy. The customers realize that the carpets will stay cleaner since the mat is also clean and it will be the first surface to come in contact with their shoes. It also represents a job that is finished 100%.
          

I take a fishing trip to Alaska each year and bring back approximately 150 lbs of halibut salmon and ling cod. I ask my clients in the interim of the job if they like to eat fish and if they do , on the last day of construction I bring them fish as a parting gift.
          

On a recent job upon completion of cleanup and while saying goodbye. I noticed the customers door was not closing properly I took my screw gun and tightened the hinge screws as the customer was seeing me out I also gave he a trick I  used to prevent them from loosening up later. 
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Always return phone calls in a timely manner. Be prompt for appointments and always call if you will even be 5 minutes late. These small things mean more than you think and your customer feels that their time is respected.