Toyota 4runner 2010 Instruction Manual page 509

NOTICE
Do not use any fluid other than washer fluid
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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
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Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the washer fluid tank.
4-3. Do-it-yourself maintenance
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