Please don't make your partner do it manually! https://www.toolstation.com/power-tool-accessories/wire-brush-for-drill/c1204
Shame the fence is fixed in place or I would also have suggested powder coating.
If you're using these, sleeves & eye protection (and gloves - but you already have padded ones because of the white-finger, right?) are a must-have.
Those little bits of wire like to fly off and embed themselves in fleshy bits.
@NotThamesWater started
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Please don't make your partner do it manually!
https://www.toolstation.com/power-tool-accessories/wire-brush-for-drill/c1204
Shame the fence is fixed in place or I would also have suggested powder coating.