Marvin,
I bought some to test, used it on the left ear of my rather beat-up Test Eagle to determine if the safety area was actually polished and the remaining blue on the gun was original (it was, and it is). It swept rust away almost magically.
This product is a strong chemical. It is noted as a copper remover, so it will attack your bronze wool (or the bronze brush I used) and leave a coppery-looking area on the surface where used.
Although it claims to not attack blue, and indeed may not in a very brief use, my recollection is that it was also advertised that it can be used as a blue remover, as any strong ammonia compound will do over time. I would be vary juicious in its use, particularly on an area where the blue is very thin; I believe it "thinned" the small area I used it on.
It might be useful on a "drop-by--drop" basis on individual spots of rust, but I would not use it as an over-all rust remover on any Luger I considered collection-quality.
--Dwight
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