Toyota 2008 FJ Cruiser Owner's Manual page 308

4-3. Do-it-yourself maintenance
Washer fluid
If any washer does not work, the washer tank may be empty.
CAUTION
When refilling the washer fluid
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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
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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 washer fluid tank.
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Open the lid.
Add washer fluid.