Has anybody had experience of how to best clean out SS fuel tanks?

I too would be interested in tips on this. Last time we did it we pumped all the diesel out and then sucked out the dregs with a vacuum cleaner poked through the inspection hatch. It seemed to work but think this might have ben an unconventional approach.

Simon, I have for the first time emptied my tanks over the winter rather than filling. When I took the inspection hatch off the expected crud in the bottom which can be removed but the sides of the tank are covered in a slime. With the tanks open this seemed a good time to do a PROPER JOB!!