Impaired driving visibility doesn't just happen on exterior surfaces. Interior glass can fog up making vision blurry and tough to see what's ahead. Use Rain-X Anti-Fog to prevent fogging before it even begins. This formula works by treating interior glass and mirrors with a coating that attracts water. This means moisture collecting on glass quickly disperses and thins out, keeping the glass clear and fog-free. You no longer have to drive with the windows down or wiping the glass as you go. Feel confident on the journey with clear, fog-free vision. You no longer have to drive with the windows down or wiping the glass as you go. Feel confident on the journey with clear, fog-free vision. Wipe onto interior glass or mirrors in a circular motion Allow to dry Reapply as needed to maintain fog-free conditions Sprinkle surface with water and wipe with a dry cloth to remove any haze that appears