Honestly, i got really lucky.
I'm always nice to people anyway but I always make sure to tip the mechanics/painters. Sometimes if I'm in their hood I stop by and bring donuts or cookies to them. The receptionist loves flowers, even inexpensive flowers ... you'd be amazed how people respond to genuine kindness. Especially when their day is filled with insurance adjusters and endless customer whining.
WTF? You never got me any flowers?!?!?