Subaru 1998 Legacy Owner's Manual page 120

B Wiper intermittent time control (if equipped)
When the wiper switch is in the "INT" position, turn the dial to adjust
the operating interval of the wiper.
B Mist (for a single wipe)
For a single wipe of the wipers, pull the lever toward you. The wipers
operate until you release the lever.
B Washer
To wash the windshield, push the washer button at the end of the wip-
er control lever. The washer fluid sprays until you release the washer
button. The wipers operate while you push the button.
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OM-H2419
OM-H0364