Usually when I go in it will be in the morning or before they close. Try to keep an extra clean shirt in your truck with you and change into that before going into the offices. I dont try to sell anything when I go in there. I just try to get my foot in their door. Get to know them a little bit and get a feel for who they are and what kind customer the can be. But dont try to sell them anything on the first meeting. Usually you will get shut down and not get anywhere with your feelings hurt. Just get to know them ask who does the service now and when its up for bid again. Ask if there is anything you can do for them and keep up with it. Email them either once every 2 weeks or call them evey month just so they can remember you. Just dont hound them with calls and emails. Hope that helps and makes sense. Im only on one cup of coffee right now.