I just got some back clamping attachments that I bought on e-bay, and am wondering how to clean off the 90-100 years of grime. There is little or no rust to speak of. I tried s soft toothbrush and warm water with Dawn dish soap. What else can I use to get them grime off? Any ideas would be helpful. I hate to leave all of that 'patina' (dirty grime) on them. Thanks.
Janis