Another way to remove rust

I noticed a few topics on here about rust. I have an old metal lathe that I have been working on that was left outside in the weather for years before I got it. It was extremely rusty. I used Evapo-rust on many of the parts and found it to be awesome on the cast iron parts.
After I am finished soaking the parts, I rinse it off with warm water and use a plastic bristle brush to remove the film left on the parts. The Evapo-rust can be reused a many times before it needs to be replaced. The more you use the Evapo-rust the darker it gets because of the iron in the rust. The makers of this product claim that it is safe on hands and is environmentally friendly. I have not used it on cookware yet but the guy in these videos does. Here is the link to a couple of videos showing it being used. When you watch the first video, pause it and read what it says on the bucket. Here are the links enjoy:
https://www.youtube.com/watch?v=Bz0_mcWzz-U
https://www.youtube.com/watch?v=YDh0GU4_Org


https://www.youtube.com/watch?v=Bz0_mcWzz-U
https://www.youtube.com/watch?v=YDh0GU4_Org