I love the stuff, it's not the same as WD-40, it is made by the same company but the properties are much different in my opinion. I use it to clean out the pivot area of my knives all the time, it literally turns that invisible (at the time) dirt into black sludge that I can easily wipe away for good. 3-IN-ONE is the best. It, unlike WD-40, actually DOES protect against rust , and does a damn good job of it too. It smoothes up the action on brand new knives, and using it liberally really helps to break in a knife during a few hundred cycles. Just like the bottle says, it "Lubricates, Cleans & Prevents Rust". Almost every knife I have has a high carbon blade, and I have yet to see ONE speck of rust on any of them. I know, there are knife-specific oils out there that were made to do the jobs listed above, but if you really think about it, the modern folder is the perfect venue for a tin of 3-IN-ONE Oil. I recommend a small tin of Multi-Purpose 3-IN-ONE Oil for any folding knife enthusiast, period.
Robert Joseph Ansbro
If it can be written, or thought, it can be filmed.
-Stanley Kubrick, 1928-1999