variable capacity

I am looking to pick up a variable capacity tank from Speidel at More wine to reduce the amount of Carboys I have to have. It would have to remain in my garage in Southern California which gets quite hot in the summer/early fall because my wife hates all of the carboys in the kitchen of our...

Does anyone have a good protocol for cleaning variable capacity stainless steel tanks? We currently use hot water and steam, but this is either not effective enough or too time consuming. We have been considering trying a caustic-acid wash, but I'm not sure how safe this would be with the moving...