1970 Swinger 340 Hemi Orange 4 speed
If you go to this site (pretty much the same stuff)
http://www.safestrustremover.com/before-after.asp# and go to the "full image slideshow" on the left side, it shows pics of guys doing there cars with a tarp and a sump with a spray nozzle. There's one with a corvette frame and they do one spot with this method and it comes out spotless. It has to run constant over the rusted metal (or be submerged) until it's clean. I figure if i do a section a day it will come out spotless. The nice thing about this stuff is it will get in all the pinchweld seams too and my car wont have to leave the garage!