A vehicle cooling fan shroud includes a barrel portion which surrounds a cooling fan and is integrated with a substantially rectilinear shroud portion which surrounds a radiator. An abrasive scrubber support is integrally formed with and extends from the forward upper surface of the cleaning head member. The protection bed 220 may absorb the NO2 or convert the NO2 to either NO or N2. Also disclosed is a method for preparing a pharmaceutical composition.