Toyota 2001 Tundra Owner's Manual page 91

In freezing weather, warm the windshield
with the defroster before using the washer.
This will help prevent the washer fluid
from freezing on your windshield, which
can block your vision.
NOTICE
Do not operate the wipers if the wind-
shield is dry. It may scratch the
glass.
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'01 TUNDRA_U (L/O 0008)
2001 TUNDRA (OM34416U)