I haven't set one up yet, but I have a good friend who's a chemist, and he suggested that I use Trisodium Phosphate over washing soda or lye. He said it would anodize the parts as it removed rust and such.
I still need to get around to setting this thing up. But I've been using this citrus-based solution that's working pretty well, so I haven't been hugely motivated.
I did get a 4.5 lb box of TSP online for $20 with shipping. You can't buy it in MI.
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