Hello again all. I set up the lye bath as described. It works great but I was wondering about something. After washing and cleaning with fine steel wool and Dawn concentrated detergent, then drying the piece off with paper towels there is a blackish residue on the towel. Do I need to re-soak in the lye or just need to keep up with the detergent and steel wool? FYI thanks to you good people I'll be setting up my electric de-rusting tank this week!