TOYOTA 2010 Yaris - Manual (Page 275)

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4-3. Do-it-yourself maintenance
Washer fluid
If any washer does not work or the low washer fluid warning light
comes on (if equipped), the washer tank may be empty.
Open the lid.
Add washer fluid.
CAUTION
■ 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.