This is a high pressure jet of water with detergent directed at the headlight lens.
The wash jet is located in front and generally just below the headlight. Some are fitted and operate in and out by using the water pressure to place them in the appropriate wash position and then retract them out of sight when not in use.
However without the headlamp wipe it is not as effective in keeping the lens clean.
But it does work very well in keeping snow and ice of the headlights in extreme conditions.
That is of course if you have the appropriate defrosting detergent in the washer bottle first.
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