Before servicing the windshield washer pump, disconnect and isolate the battery negative cable. After that, remove the wire harness connector from the washer pump and take off the washer supply hose, draining the washer fluid into a clean container where you keep it for reuse. With a trim stick or similar wide flat-bladed tool, gently lift the barbed end of the inlet nipple out of the reservoir's rubber seal, without damaging any parts. Take out and toss the rubber grommet seal from the reservoir. To set up, turn back the process used for uninstalling, making sure there is a new grommet seal on the reservoir.