I did my blade that way and it took a day in the tank, but when it came out the rust was turned into a black residue and the paint came off with a putty knife. After drying it off I used a wire wheel to cleanup a few spots and primed it. the blade and the subframe looked almost new when it was done. For the cost of a box of washing soda and a clean piece of scrap steel and my time to wait... saved me a pile of cash.
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"We don’t stop playing because we grow old, we grow old because we stop playing." 
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