Necessary preliminary tasks

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Remove LOWER SECTION OF MICROFILTER HOUSING

Press detent lug (1).

Detach unlocked plug housing (2) in direction of arrow.

Detach hose (3) from spray nozzle.

Fig 1: Detaching Unlocked Plug Housing

Courtesy of BMW OF NORTH AMERICA, INC.

Release spray nozzle (1) in direction of arrow from cowl panel cover and remove.

Installation:

Make sure spray nozzle (1) is correctly seated.

Fig 2: Releasing Spray Nozzle From Cowl Panel Cover

Courtesy of BMW OF NORTH AMERICA, INC.

Installation:

Following parts of spray nozzle (4) must not be damaged or missing:

Plug connection
Hose connection
Detent lug, bottom

5 Detent lug, top

Fig 3: Identifying Spray Nozzle With Plug And Hose Connections And Detent Lugs
Courtesy of BMW OF NORTH AMERICA, INC.