Using Windshield Glass Knife

Disconnect the ground cable from battery. (Models with wiper deicer)
Remove the front pillar trim. Ref. to REMOVAL , Upper Inner Trim.
Disconnect the wiper deicer connector. (Models with wiper deicer)
Remove the cowl panel. Ref. to REMOVAL , Cowl Panel.
Remove the molding from the glass and tape the body side of the circumference of windshield glass for protection.

Fig 1: Removing Windshield Glass Using Glass Knife
Courtesy of SUBARU OF AMERICA, INC.
Remove the windshield glass.
1. Apply sufficient amount of soapy water to the adhesive part and insert the windshield glass knife.
2. While holding the knife edge and windshield glass edge at a right angle, move the windshield glass knife parallel to the windshield glass edge along the surface and edge of windshield glass to cut the adhesive.
  CAUTION:
  - Cutting of adhesive part should be started with wider gap between windshield glass and body.
  - Never twist the windshield glass knife.
    
    Fig 2: Removing Windshield Glass Adhesive
    Courtesy of SUBARU OF AMERICA, INC.
3. Disconnect the locating pin and remove the windshield glass.
  NOTE: The locating pins are bonded to the corners of glass. Use piano wire to disconnect the pins.
  
  Fig 3: Disconnecting Locating Pin
  Courtesy of SUBARU OF AMERICA, INC.