[Tatsfield]

Seems to me that Volvo made a mistake when specifying the sound deadening material. What they needed to have fitted was moulded foam inserts with an sealed impenetrable surface, a concave top and a central drain hole right through the moulding to allow water to drain through without being absorbed into the foam. What they did was cheap and nasty and looks like it can act as a corrosion poultice on the wing.