Not removing unwanted hair in undesirable locations. Rust reversal.
My set-up is as simple, cheap and ugly as you can get. If you want the scientific explanation as to how it works, google it.
I just wanted to show how easy it is to set up and start using.
What I use:
some sacrificial iron [rebar will do, and I added some scrap metal
a 5 gallon bucket
a package of washing soda from the laundry section of the supermarket
an auto battery charger. I found this one at the dump
some wires and alligator clips.
Here's what it looks like:
All the scrap is in electrical contact. Positive goes to your scrap metal, get it wrong and you ruin your piece.
I add a couple of cups of washing soda to tap water, and nearly fill the bucket.
Here's a saw, the right half was in the bath, the left half will go in next.
Once the piece sits in the bath for a couple of hours, take it out, scrub with a scotchbrite pad, clean, dry and oil it.
And you're good to go.
It ain't rocket surgery.