|Is it a snake?|
After much searching for a suitable container large enough and strong enough to take a pair of chains, a S&DRHT volunteer, Dave Read, came up with the ideal thing, an agricultural style tank which may have done service in a dairy originally! It's always a good idea to explore other technologies for solutions to your own!
The chains will remain submerged for a couple of months before further examination.
One method of cleaning the chains I was recommended was to set fire to them to dry off the diesel. How ever good an idea it may be, the H&S police would probably have a heart attack at the thought!