Lexus SC 430 2006 Owner's Manual page 224

Washer fluid
■ Adding fluid
NOTICE
Use washer fluid only
■
Do not use soapy water or engine anti-freeze instead of washer fluid.
Doing so may result in streaking the vehicle' s painted surface.
Diluting washer fluid
■
Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the washer fluid tank when diluting
washer fluid.
4-3. Do-it-yourself maintenance
Add washer fluid it approaches the
NORMAL (maximum) line.
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