Now, this has to be one of the best (if not THE best) rust removal techniques there is!
Check out
www.stovebolt.com/techtips/rustremoval.htm I just removed ALL the rust of my 50+ year old rust covered headers.
The process took about 5 hours in the solution and all I had to do was rinsing them off and scrubbing them moderately with a plastic bristle brush.
This method is truly amazing and safe!
Cost: ZERO
Effort: ZERO
Result: PERFECT