Toyota 4runner 2009 User Manual page 384

4-3. Do-it-yourself maintenance
CAUTION
n When refilling the washer fluid
Do not refill the washer fluid when the engine is hot or running, as the
washer fluid contains alcohol and may catch fire if spilled on the engine etc.
NOTICE
Do not use any fluid other than washer fluid
n
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.
388
If the washer fluid level is at
LOW, add washer fluid.