jim haseltine
Senior Retro Guru
If anything gets through the corrosion it'll be Bilt Hamber Deox-C. It might take a few days but I've know it wick it's way under powder coat. The problem would be finding some sort of container of a suitable size and shape that wouldn't mean using several gallons of the stuff just to be able to submerge the entire BB shell. However, I suspect you'll end up taking the advice to chop it to bits.