If you expect to dip a light into HP and it will magically dissolve everything and batteries just fall out, it most likely wont happen, HP cleans off residue from contacts, springs, and cleans up battery slots in remotes, or anywhere where you can get to after removing a battery ,it leaves no trace of leakage, but when a cell is swollen and stock inside, or worse several cells, with electrolyte solidified between them, probably nothing will get them out easy, you can try putting battery tube, in a HP bath for 15 -20 min (longer exposure of HP to air and uv light will turn into into water, that is why bottles of HP are almost always dark) hopefully it can get between cells and a battery tube. but most likely you'll have to use force to get cells out.