Toyota 2009 Tundra Owner's Manual page 516

NOTICE
n Do not use any fluid other than washer fluid
Do not use soapy water or engine antifreeze instead of washer fluid.
Doing so may cause streaking on the vehicle's painted surfaces.
Diluting washer fluid
n
Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the washer fluid tank.
4-3. Do-it-yourself maintenance
4
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