Anyone else tried this? I bought some to try on that 100 year old National sewing machine. Some of the removable parts were badly rusted. Soaked them all day in a bowl with this and the rust went away! Took it all down to bare metal. I can wax them or clear coat them now. I was skeptical when I watched the video on their site but it really does work. And it's non-toxic and biodegradable.
