Toyota Lexusc Owner's Handbook Manual page 81

SWITCHES
For mist wiper operations (a single wipe), pull the lever up
and release it.
To make the washer squirt, pull the lever toward you and
release it.
Also, the wipers will automatically operate a couple of times
after the washer squirts even with the lever in the "OFF"
position.
Vehicles with headlight cleaner — If you pull the windshield
washer lever toward you with the headlights on, the headlight
cleaner operates once automatically together with the
windshield washer fluid.
NOTICE
Do not operate the wipers if the windshield is dry. It may
scratch the glass.
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The low washer fluid warning light in the instrument cluster
comes on when the fluid level in the tank becomes nearly
empty. For information on adding washer fluid, see "Adding
washer fluid" on page 702.
In cold weather, warm the windshield with the defroster before
using the washer. This will help prevent icing, which could
block your vision.