another good thing for removing rust is a 10 to 1 solution of molasses in water ! the longer you let it soak . the cleaner the surface gets till it is copletely rust free !
I just got through cleaning a tank with Vinager. It did fairly well, it will get under what has peeled but you will have to try something else where it hasn't come loose yet.I was wondering how the old peeling sealer acted with the vinigar.
guess I can't hurt anything, its peeling as it is now!