PresTx82 wrote:The washing soda is harder to find and most households have the baking soda so that's what I used. I don't think there's much of a difference chemically.
researching says the washing soda is more alkaline (same as the pool stuff). Mine has a LOT more gunk on the top of the water and it may be the time it takes. Not sure what you mean when you say "many hours"
here are a couple of links. just google "rust electrolysis" and you can find numerous links. most say to not use baking soda but if it works for you.