Could be but could also be general moisture collecting and turning to the dreaded mayo due to lots of short journeys.
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If you have only been tootling around of late wipe it off, check your oil and coolant levels
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(and smell
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/ colours) and then go out for a nice long drive.
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Check things again when you get back and if it's clear I suspect you'll be fine.
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The performance issues could be down to all kinds of things
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- has it had a service recently?