GM Service Manual Online
For 1990-2009 cars only
(Windshield Washer): Press and hold the windshield washer paddle with this symbol on it to wash the windshield. The spray continues until the lever is released. The wipers will run a few times and stop. If the wipers were already on, they will resume at the speed that was selected earlier.

Caution: In freezing weather, do not use your washer until the windshield is warmed. Otherwise the washer fluid can form ice on the windshield, blocking your vision.