If you just want to clean it, why not do this in-situ? I have done this on my 36 and "Good Grief" did it on his 33.
Remove the fuel, I did this with a 12 volt fuel pump from EBay. If you have another filter, it can be cleaned by passing it through the filter a couple of times after putting some treatment solution in it. I used Solatron.
One or two holes can then be cut in the top of the tank using a proper hole cutter. Try to keep as much swarf out of the tank as you can. Before this purchase a retro fit hatch from TecTank to get the right size. The hole is about 150mm in diameter, enough to get an arm into.
The tank can then be cleaned using great quantities of kitchen roll or similar. My tank had a layer of sludge all over the bottom, and some on the sides. On the 36 two hatches had to be put in to reach all of the inside of the tank. The hatches only need the one hole cut as they have a central bolt system.
They have been in place for a year now, and have not leaked. It also means that I can open a hatch and shine a torch in to see if there is any sludge forming - so far, so good.
Hope this helps, but if you any questions, get back to me.
PS do not buy diesel in Dunkirk.