Don't know. I have had good results with that stuff when its fresh but loses strength too quick for what it costs. For heavy rust vinegar is way better. Just don't want to risk the chrome. I could try on one of my old ones. Problem is I already painted the insides so would need to strip that out first. Or maybe I can find some other old chrome here to test. Maybe an old door handle. Not sure though are they regular steel underneath - that rusts?