I am reviving this thread because I just finally got around to trying the Noxon. I bought some on Amazon soon after this thread started. WOW! Thanks for the tip! That stuff is amazing! So much removed with very little labor. REALLY impressive! I have several swords with rust now. I know, I am ashamed. I have no excuses. I actually won another Gim at a raffle at our annual banquet a bit over a year ago. That let me procratinate on cleaning my older Gim as I used the newer one for my test in front of my GM. But that one is rusty too now. I am about to apply some oil on this first gim that I tried this on. I am going to share some of my Noxon with some fellow students............ Edit - I just cleaned my second newer gim. The rust was only a couple of months old, compared to years on my older Gim. But there was more of it and it was a bit harder to remove. Also left more discoloration on the blade. I can only guess the sword quality of the second gim is poorer than the first? I know the second gim came in a shipment for a seminar. And that my school carries a different brand now. Which makes me think they were not satisfied with the quality? I think I will ask. My first Gim came from a shop in San Francisco we visited for our GM's tournament- Brendon Lai's store. Anyways, even on the second gim - the results in fixing bad rust was pretty impressive. I won't be embarrassed to use either one in the school anymore!