Lexus RX 450h 2012 Owner's Manual page 525

4-3. Do-it-yourself maintenance
CAUTION
When adding washer fluid
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Do not add washer fluid when the hybrid system is hot or operating as washer fluid
contains alcohol and may catch fire if spilled on the hybrid system etc.
NOTICE
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
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Dilute washer fluid with water as necessary.
Refer to the freezing temperatures listed on the label of the washer fluid bottle.
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