Originally Posted by Touring05
If there is too much dirt accumulating you might need to bring it to the attention of your dealer, but I'm not sure what their threshold is. Some people get things fixed easily, others have to fight and struggle just to have Ford and or the dealer say its normal.
Lamp assembly condensation
Exterior lamps are vented to accommodate normal changes in pressure.
Condensation can be a natural by-product of this design. When moist air
enters the lamp assembly through the vents, there is a possibility that
condensation can occur when the temperature is cold. When normal
condensation occurs, a thin film of mist can form on the interior of the
lens. The thin mist eventually clears and exits through the vents during
normal operation. Clearing time may take as long as 48 hours under dry
Examples of acceptable condensation are:
• Presence of thin mist (no streaks, drip marks or droplets)
• Fine mist covers less than 50% of the lens
Examples of unacceptable moisture (usually caused by a lamp water
• Water puddle inside the lamp
• Large water droplets, drip marks or streaks present on the interior of
Take your vehicle to a dealer for service if any of the above conditions of
unacceptable moisture are present.
From pages 126-127 of the 5th revision of the 2012 Ford Focus owner's guide for confirmation.