Why are there foam bags in the wings of our Ford Transit?

I recently noticed a length of soft foam (sealed in plastic) in the space inside the rear of the front wings of my son's Ford Transit Mk8, just below where water from the windscreen drain holes empty (and which block easily with muck). I was wondering what these "foam bags" are actually there for and would they be better not there at all (to prevent any possible trapping of water and dirt)?

Asked on 27 November 2019 by David Van Ham

Answered by Dan Powell
Ford calls these bags 'fender stuffers'. There should be one bag on each side of the bumper area. They are designed to dampen noise and vibration from the engine bay into the interior.
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