Something that works very well on dried rust and blood stains on fur is to take a little WD-40 on a clean cloth, and gently rub. As the cloth becomes discolored, turn it so you always have a clean surface, occasionally adding some WD.
...I have heard recent concerns that WD-40 builds toxic levels in your liver, and can actually kill you with enough exposure. ****...I have used it all my life and have even washed my hands with it, and used it for attractant for Sturgeon fishing....guess I am going to die......this is second hand info, I havent actually heard anything from an expert, so with however many grains of salt.....be careful how much gets on your hands and wash them good.
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