GMC Sierra Denali Owner's Manual page 132

You can set the wiper speed for a long or short delay
between wipes. This can be very useful in light rain
or snow. Turn the band to choose the delay time. The
closer to the top of the lever, the shorter the delay.
For steady wiping at low speed, turn the band away from
you to the first solid band past the delay settings.
position. For high-speed wiping, turn the band further, to
the second solid band past the delay settings. To
stop the wipers, move the band to off position.
Be sure to clear ice and snow from the wiper blades
before using them. If they're frozen to the windshield,
carefully loosen or thaw them. If your blades do become
worn or damaged, get new blades or blade inserts.
Windshield Washer
There is a paddle marked with the windshield washer
symbol at the top of the multifunction lever. To
spray washer fluid on the windshield, push the paddle.
The wipers will clear the window and then either
stc~- 3r return to your preset -reed.
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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