Steel Picture Frames

I have two steel horseshoes from my pony, I want to clean them, what chemicals are good for cleaning them. I continuously scrub them and they still smell like manure, I want to turn them into picture frames to the smell needs to go. Essentially — Break out the white vinegar and fine steel wool. Soak for a day or two , then scrub with steel wool. I did this and an old , nasty looking pair of cavalry spurs I got at an auction. Once clean, I found they were solid nickle and had markings proving they were 1911 issue officer’s spurs from WWI .