Fog on the inside of the windows

The defroster function should be used to remove fog or mist from the inside of the windows.
Keeping the windows clean with a commercially available window washing spray will also help prevent fogging or misting.
See also:
Setting a speed
Use the or
buttons set the vehicle's current
speed. The set speed is shown in the display.
NOTE
Cruise control cannot be engaged at
speeds below 20 mph (30 km/h). ...
Use of Additives
With the exception of gas line antifreeze during
winter months, do not add solvents, thickeners,
or other store-bought additives to your
vehicle's fuel, cooling, or lubricating systems.
Overuse ...
Volvo maintenance
Volvo advises you to follow the maintenance program outlined in the Warranty
and Service Records Information booklet. This maintenance program contains inspections
and services necessary for the p ...
