I use Molases and love it. It stinks, and your parts flash rust, the second you take em out, and presure wash em, but its so cheap and easy. Its the Phosphuric acid in the Molases that dose it. I use roughly a 7 to 1 mix, but its never an exact mix. It pays to have all grease and paint off the part before completely submerging. Any bit poking out the brew will rust badly. Its cheap, and only takes a few weeks. I take the part, or parts out after a week, and presure wash, then put em back in for another week. Its quite amazing how the rust just washes off.