When I first started out I used to knock on each customers door or insist employee would before starting work. Over time I have gotten away from this as I started assuming they knew we were there ( reg. schedule) and did'nt need to come to the door just to say hi. Is it unprofessional just to show up and get started without greeting the customer ? No customer has complained , I just wonder what others think. ( obviously a new customer would certainly need an introduction ,but for established long term customers is it necesssary each week?).