For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningWasher Fluid
What to Use
When windshield washer fluid is needed, be sure to read the manufacturer's instructions
before use. If operating the vehicle in an area where the temperature may fall below
freezing, use a fluid that has sufficient protection against freezing.
Adding Washer Fluid
Open the ca ...
Installation Procedure
Apply structural adhesive on the flanges of the rear side door inner
panel where the rear side door outer panel bears on.
Align the rear side door outer panel.
Verify the fit of the rear side door outer panel.
Clamp the rear side door outer panel
into position.
Pre-fla ...
Exit Lighting
The headlamps, taillamps, parking lamps, back-up lamps, and license plate lamps
come on at night, or in areas with limited lighting, when the key is removed from
the ignition.
The dome lamps also come on when the key is removed from the ignition. The exterior
lights and dome lamps remain on a ...