Any mild acid can be used to get rid of rust, I used pineapple juice for a long time, like about 50 years, but then the stuff I was using became unavailable, the substitute was rubbish, so I went to ordinary household white vinegar, the cheapest I can buy.
I use a wall paper trough to soak the blades, inspect daily, rinse daily, scrub with various things depending on what needs to got rid of, pick off the hard encrustations with a sadler's awl, sometimes scrape off big encrustations with a small scraper made from a three corner file.
Treatment time can vary from a couple of days to a couple of weeks, I just keep returning the blade to the vinegar until it is clean, sometimes it might be necessary to change the vinegar. I have never known the vinegar to cause any blade damage.
I've used this method on a wide variety of blades, seems to work well on everything I've tried it with, however, a katar might have small gaps where metal meets metal, and it would not be easy to get residual acid out of those gaps. Occasionally I might use a slurry of bi-carb of soda to kill the acid, then thoroughly rinse off the bi-carb.
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