From what I've been told by a friendly BMW technician, BMW's "Fuel Induction Service" is comprised of tapping into the fuel rail and pumping a thick green cleaner in with the existing fuel. The relay or fuse to the car's fuel pump is pulled, then the vehicle is started and allowed to run only on the cleaner/gasoline mixture. The car is shut off just before it stalls out. The thick green liquid comes out of a black steel drum so he has no idea what it is. After the cleaning a bottle of this stuff is dumped into the fuel tank and the customer is sent on his way:
