Wiper Blades and Washer Fluid. Using the Wipers
The wipers and the washer fluid are designed to improve visibility and the headlight pattern.
The washer nozzles are heated* automatically in cold weather to prevent the washer fluid from freezing.
When there is approximately 1 liter (1 qt) of washer fluid remaining, a message to refill will appear in the instrument panel.
Using the Wipers
The windshield wipers are used to clean the windshield. The right-side steering wheel lever is used to adjust windshield wiper settings.

Right-Side Steering Wheel Lever.
The thumb wheel is used to set rain sensor sensitivity and interval wiper speed.
Single Sweep
Move the lever down and release for a single sweep.
Wipers Off
Move the lever to position 0 to turn off the windshield wipers.
Intermittent Wipers
Move the lever upward to put the wipers in interval wiping mode. Set the number of sweeps per time unit with the thumb wheel when interval wipers are selected.
Continuous Wipers
Move the lever upward for the wipers to operate at normal speed.
Move the lever upward again for the wipers to operate at high speed.
* Option/accessory.
Test yourself
A quick Volvo XC90 quiz: every answer comes with an explanation and a link to the manual page.