Molasses in water really works, but you need the patience of Job, and pegs for delicate noses; alternatively place your tank down the road and around the corner and not too near a neighbour you like. As mentioned previously, electrolysis is most effective adjacent to the anodes. By contrast the molasses technique seems to slowly clear up rust in all sorts of difficult to get at places. The process may need warmth. Unsure of this due to the fact that we get 'sun' down here. Robert