Rust Buster that seems to work

[TWFAUST at aol.com]

While browsing a machinist's blog, I came across an article testing the  
effectiveness of all the commercial rust busters, Kriol, PB Blaster, Liquid  
Wrench, etc. Surprisingly, the best commercial product was "Liquid Wrench", 
but  the absolute winner was a 50-50 solution of Acetone and Transmission 
fluid. 
 
    I decided to test it out on a pair of convertible  latches from a 
250sl. The screw portions were frozen solid. I had tried PB  Blaster and as much 
heat as I thought the chrome would bear. They had resisted  all my efforts 
and were still frozen solid. I mixed up the acetone/tranny fluid  combo (I 
used Type F, because I believe that to be without synthetics. For all I  know, 
synthetics might be better). I soaked the latches for about 24 hours,  
clamped them in a vice and tapped them with a hammer. They broke free. I had  
attempted clamping and tapping before with no noticeable effect.
 
So, I guess I am converted to acetone/tranny fluid. A note on my  
observations, the material that came out of the threads was black, rather than  brown 
as one would expect from rust. This leaves open the possibility that the  
problem was calcified grease. Nonetheless, the commercial products failed and 
 the acetone mixture worked. All the cautions associated with acetone 
should be  observed.
 
Tom Faust