Biff shortly after he finished waxing Marty McFly's car.
Biff's Auto Detailing was an auto-detailing company run by Biff Tannen. Biff would come to the homes of his customers to wash and wax their automobiles. The business phone number, listed on the side of his truck, was 840-3051.
After Marty McFly destroyed the Grays Sports Almanac in 1985A, the text of the matchbook that he was holding changed from Biff Tannen's Pleasure Paradise Casino & Hotel to Auto Detailing.