This was a problem known to Citroen and Slough models had a hook fitted on the toe board next to the steering column base that can be used to retain the clutch pedal in the depressed position if the car is to be left for a period of time.
Condensation is the big enemy here, when air temperature changes quickly, then moisture condenses on cold metal components and in this case, rust forms.
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This reply was modified 7 years, 1 month ago by Editor FP.