It's not a reverse polarity. All it do'n is running a current from one metal to another thru a mixture of water and baking soda. I've used this method for at least 10 yrs on thin stuff i didnt want to blast.
4dabird, i use Armor Hammer SuperWash baking soda. Been about 5 yrs since i bought the last box, but think it's located in the laundry section.
