Sorry, i missed the question (even though it was for someone else) -
Its great, you have a tank with an electrolyte, and a sacrificial anode. You dump in your rusty old part, connect up the power, it fizzes away for a while (but not like acid - ill explain in a moment) and you pull it out, point the pressure washer at it, and the rust just washes away, leaving dull silver or somtimes blackened metal behind.
When i say its not like acid, the key point is that you could leave the job in the electrolysis tank for months, and the process stops when the rust is gone. With acid the acid will keep eating until you wash it of.
Ive got to do a landover bumper when i get around to it - ill use a 205ltr plastic drum, and fill it to just over half way up the bumper - do one side then flip it.
I use a scary electrolyte (NaOH) which makes the process dangerous but you can use non caustic ones also. I like NaOH as i buy it by the sack full for another process, and it stips paint etc. also whilst the job is in there, but its fearful stuff if you get it on you without realising.