Toyota 2008 Prius Quick Reference Manual page 405

4-3. Do-it-yourself maintenance
NOTICE
n When recharging the 12 volt battery
Never recharge the 12 volt battery while the hybrid system is running. Also,
be sure all accessories are turned off.
Washer fluid
CAUTION
When refilling the washer fluid
n
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.
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PRIUS_U_(L/O_0802)
If any washer does not work, the
washer tank may be empty. Add
washer fluid.