unfortunately, the best way to do it is to drop the tank out which is pretty labor intensive, and for one drain it completely, then slosh a shit load of bb's around in the tank, they are like little scrubbing bubbles

also when there, make sure the baffle underneath the fuel level sender is in tact, otherwise the car will cut out in right hand corners with lower fuel levels. do you have a bentley for a diesel rabbit? if not swing out, i think mine covers diesel rabbits in your year range, not positive though!