Toyota Auris 2013 Owner's Manual page 327

NOTICE
 When the rear window is dry
Do not use the wiper, as it may damage the rear window.
 When the washer fluid tank is empty
Do not operate the switch continually as the washer fluid pump may over-
heat.
 When a nozzle becomes blocked
In this case, contact any authorized Toyota dealer or repairer, or another
duly qualified and equipped professional.
Do not try to clear it with a pin or other object. The nozzle will be damaged.
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4-3. Operating the lights and wipers
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