That doesn't make much sense, the area of rust doesn't matter, it's how deep it is. Suspension knuckles will be quite embedded, it's the cast nature.
Deox gel isn't ideal, Deox C bath is, you'll need to keep applying the gel until it's cleared the rust, it will work, it's just slower with heavier rust. Apply it thicker to deal with more rust in one go.
Done it 3 times now and it isnt changing. Iv now used all the gel as it was put on thick. Iv got the worst of it out now anyway which was the whole point.
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