Lexus 2012 RX450h Owner's Manual page 765

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When adding washer fluid

Do not add washer fluid when the engine is hot or running as washer fluid contains

alcohol and may catch fire if spilled on the engine etc.

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.

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

Dilute washer fluid with water as necessary.

Refer to the freezing temperatures listed on the label of the washer fluid bottle.

4-3. Do-it-yourself maintenance