Subaru WRX 2015 Owner's Manual page 230

For a single wipe of the wipers, push the
lever up. The wipers operate until you
release the lever.
Wiper intermittent time control
When the wiper switch is in the
position, turn the dial to adjust the operat-
ing interval of the wiper. The operating
interval can be adjusted in several steps
from the shortest interval to the longest.
Windshield washer
To wash the windshield, pull the wiper
control lever toward you. The washer fluid
sprays until you release the lever. The
wipers operate while you pull the lever.
Instruments and controls/Wiper and washer
NOTE
The windshield washer fluid warning
indicator appears when the washer
fluid level in the tank has dropped to
the lower limit. If the warning indicator
appears, refill the tank with fluid. For
the refilling procedure, refer to Wind-
shield washer fluid
3-105
11-37.