Hey Bilbit, I don't know what's available in France or what you like to use but I would bathe the corroded plastic in Scrubbing Bubbles (or again the French analog).  In a few hours the corrosion will more or less be gone (generally (if you bathe it) without any real scrubbing).

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Thanks, if the plastic was still in good nick i will have had a try, but it was too far gone to even think about it. I am keeping the main parts, rest has been tossed.