Thanks guys,
Matt, I was hoping there would be something like that. Some miracle chemical that strips the rust away, leaving the inside clean (and possibly has a delightful minty fragrance). I have started looking into the range of tank cleaners & sealers, such as POR 15 etc.
Hanno,................seriously! People actually do those things. Guess the industrial revolution has come around again. I do understand that those would be good mechanical debridement, but what about the baffles inside preventing free movement, or worse, damaging the baffles themselves. I do like the glass idea. That's really quite ingenoius. Not sure exactly how I would set the tank up for continuous shaking or rotation.
A friend of mine has a dog that's epileptic. I could gaffer tape the tank to his back, I guess!
Seriously though, thanks guys
P.S: Ordered new front wheel cylinders from Rockauto in USA. They were just over $31.00US each, and with postage still came to less than $100AUD. Shipped via FedEx and trackable. I'm following their progress since they were despatched several days ago. I lead a sad little life.