Our next job was to restore the petrol tank, which is quite rusty. We made an improvised molasses tank out of old boards and two thicknesses of heavy duty polythene sheeting. We submerged the petrol tank in the molasses at 6:1 strength for 18 days and this was the result. Unfortunately our molasses tank was not quite deep enough to completely submerge the petrol tank, so the exposed parts are still rusty. However we are still impressed by its effectiveness on the submerged parts. Its surprising more people don't use molasses, which is cheap, biodegradable, non-toxic and convenient, as long as you're not in a hurry
.