Lexus RX450H Manual page 271

2-3. Operating the lights and windshield wipers
NOTICE

When the rear window is dry
Do not use the wipers, as they may damage the rear window.

When the washer fluid tank is empty
Damage to the washer fluid pump may be caused if the lever is operated
continually.

When a nozzle becomes blocked
In this case, contact your Lexus 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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