[StingRay]

I soak parts in several solutions. I've used citric acid, phosphoric acid, Evaporust and diluted molasses, All are very good rust removers. So far none of them actually gets the rust out of the seams. Even after soaking for months if you split the pinch weld or unfold a door edge there are still significant rust deposits. It is of note that with most of these most or all of the internal corrosion protection that may have been left is gone once dipped. A commercial dipper would have to be using some nasty stuff to get into the pinch welds and I'd be scared that they didin't get it all out.