Evapo rust.
I can't say how impressed I am with this stuff. I am cleaning a ton of bolts and pieces that I want to reuse.
It did a great job on my door screws and ferrells, not to mention my floor vent brackets and arms.
I have been picking it up at harbor freight, $25 a gallon I think, and you can reuse it somewhat... pretty good bang for the buck.
The bolt "smoke ring" made me smile... not sure what came off of that bolt, but I am sure it was bad.
