I also cleaned a few of my blades some 2 months ago, and those blades also quickly developed a brownish layer of rust when left exposed overnight.
I've just now taken one of them out of the vinegar bath, given in a scrub of bi-carb, cleaned it with warm water and detergent, dried it with a cloth and blowdryer, and soaked it with WD40. It's now in the garden, and tomorrow I'll drench it with WD40 again.
In some 2 days I'll inform you of my, hopefully successful, progress.
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