I just got a killer deal on a 2009 Cub Cadet SLTX1050. I had to remove the 50" deck to fit everything in my utility trailer and saw a heavy buildup of clumped grass on the underside. The PO said he never cleaned it and didn't bother using the built in "deckwash". I cleaned the underside with a plastic putty knife then powerwashed it. At least 1/3 of the area is bare metal, some rusted. I'm guessing spray can Rustoleum would be totally ineffective. Any suggestions?