Sounds like you probably tried all short of sandblasting, but a wire brush might do the trick. If it does, you could then get a wire brush attached to a drill
Thanks,at £2.66 for a set I’ve just gone straight for a 3 pack of wire brushes for a drill and will see how I get on!
Twisted wire cup.
@thegreatbelow started
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Sounds like you probably tried all short of sandblasting, but a wire brush might do the trick. If it does, you could then get a wire brush attached to a drill