Lexus 2004 GX470 Owner's Manual page 52

To make the washer squirt, pull the lever toward you and
release it.
If the wiper lever is in the "OFF" position, the wipers will
automatically make 3 wipes and then a single wipe later to
sweep the windshield completely.* The interval between the
3 wipes and the last wipe will depend on the vehicle speed. The
last sweep does not happen if the vehicle speed exceeds about
170 km/h (106 mph).
NOTE:
* The last single wipe can be deactivated.
Ask your Lexus dealer for details.
NOTICE
Do not operate the wipers if the windshield is dry. It may
scratch the glass.
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 572.
In cold weather, warm the windshield with the defroster before
using the washer. This will help prevent icing, which could
block your vision.
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