a vehicle foot well having a surface including a floor, an upstanding generally longitudinal first wall extending upward from the floor, an upstanding generally transverse second wall extending from the floor and substantially formed at an angle to the first wall, the foot well being generally arranged in a longitudinal or fore and aft direction substantially parallel to a direction of travel of the vehicle;

a vehicle foot well surface model which replicates the vehicle foot well surface;

a tray formed of polymeric material for fitting into the vehicle foot well and having an upper surface and a lower surface, at least ninety percent of the lower surface of the tray being within 0.25 inch (0.635 cm) of the vehicle foot well surface model when the vehicle foot well surface model is mathematically superimposed to best fit the lower surface of the tray;

a reservoir formed in the upper surface of the tray to be located within an aft two-thirds of the upper surface of the tray and to occupy an area between ten and fifty percent of the upper surface of the tray, a circumferential wall defining a lateral boundary of the reservoir, the wall having a depth of at least 0.050 inches (0.0127 cm); and

the tray having a floor, an upstanding generally longitudinally oriented first wall of the tray extending from the floor and substantially conforming to said first wall of the vehicle foot well, an upstanding generally transversely oriented second wall of the tray extending from the floor of the tray and substantially conforming to said second wall of the vehicle foot well.