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Freewheel rusted after cleaning

edited August 2017 in Workshop
I cleaned my Carrera TDF's freewheel with an ordinary cog-cleaning brush and some Muc-Off, then I decided to clean my old bike's freewheel too, but I used a wire brush. The old bike's freewheel had started rusting the next day. Was it something to do with the wire brush?
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