GMC 1993 Suburban Owner's Manual page 104

K2246
At the top of the multifunction lever there's a paddle with the word PUSH on
it. To spray washer fluid on the windshield, push the paddle.
The wipers will clear the window and then either stop or return to your preset
speed.
Q
Driving without washer fluid can be dangerous. A bad mud
splash can block your vision. You could hit another vehicle or go
off the road. Check your washer fluid level often.
8
In freezing weather, don't use your washer until the windshield is
warmed. Otherwise the washer fluid can form ice on the
windshield, blocking your vision.
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