My first question is (not trying to be a wise a$$)
Are you sure it’s rust and not corona staining?
Another question is this vehicle used for mostly short trips (under 5 – 10 miles) a lot?
If so it is not uncommon for moisture to build up because the engine doesn’t stay running long enough at operating temps to dry out completely.
With the amount of mileage you describe it is possible that the valve cover gasket and spark tube seals my need replacing.
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