What's your method?
If I get actual rust, I keep a little peice of 600 grit sand paper near the sink and give the blade a quick scrub.
I find green ScotchBrite does OK at removing the top layers, but without a chemical to mildly etch it out it can only do so much. BKF is a gentle-enough acid, with a gentle-enough abrasive to do a wonderful job.
The ScotchBrite I use is the coarse one, color mauve/brown. I must agree not the deepest patina is being removed, but have never wanted to do so.
Concentrated nitric acid. It'll get that nasty patina ALL the way off!
"The Buddha resides as comfortably in the circuits of a digital computer or the gears of a cycle transmission as he does at the top of a mountain."
After the acid, you may want to neutralize. Baking Soda should do the trick...
one man gathers what another man spills...