Abstract: A washer fluid system (20) in a motor vehicle (10). A walled reservoir (22) holds washer fluid used to wash one or more windows (16) of the vehicle. Washer fluid is introduced through a fill opening (26) to fill the reservoir. The reservoir has one or more through-openings (36, 38, 40, 42) in a wall (44) at a location suitable for venting air from the reservoir during filling. One or more fluid-impermeable, air-permeable elements (46, 48) close the one or more through-openings. The elements are patches adhered to the reservoir wall in covering relation to the through-openings. Venting through such an element can eliminate the vent tube or neck used in prior washer fluid systems and enable more complete filling of a reservoir.