TOYOTA 2011 Yaris Hatchback - Manual (Page 169)

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2-3. Operating the lights and wipers
NOTICE
n When the windshield is dry
Do not use the wipers, as they may damage the windshield.
n When there is no washer fluid spray from the nozzle
Damage to the washer fluid pump may be caused if the lever is pulled
toward you and held continually.
n When a nozzle becomes block
Do not try to clear it with a pin or other object. The nozzle will be damaged.