Kichler Outdoor Lighting

Kichler outdoor lighting does aluminum oxidizes and leave a bluish film. If yes how do I fix.

These lights have been covered by the manufacture of bronze so they can get a bluish patens on goal. For this "look" to make them older.
However, if you want them to look like they did when new, consult a coin dealer and ask for cleaner coin or use Tarn-X to your local hardware store. Follow the instructions and when cleaning paint a clear finish your job to protect it from happening again.