• Don't use the green scourer! if you must scour, then use a white one.
    I have used Hammerite Rust remover Gel with some success. Not the common one which strips to bare metal, but one which is safe for use on paints (from homebase)
    For such a nice frame I would suggest Oxalic Acid bath is the way forward, though I don't know how it would affect the paint.

    Pics?

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