See also:

Single sweep
Move the lever upward from position 0 to sweep the windshield one stroke at a time for as long as the lever is held up. ...

Symbols and messages in the display
...

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. Overus ...