I had just put these on the plane a few years back and already they are clouded. So I called AirModsNW and ordered two more sets. Killing time yesterday, I took out my Harbor Freight Car Headlight polisher and used some Novus to see what I could do to save the lenses.
![5-09-001](http://gpa.grumman-parts.com/wp-content/uploads/2015/05/5-09-001-300x200.jpg)
As you can see, quite a bit of difference. The polisher is in the second shot after 30 seconds of buffing with Novus 2 (medium). I followed up with Novus 1 (fine).
![5-09-002](http://gpa.grumman-parts.com/wp-content/uploads/2015/05/5-09-002-200x300.jpg)
These 1/2 gallons will last quite a while and are a bit pricey but work on plastic and paint equally.
![5-09-003](http://gpa.grumman-parts.com/wp-content/uploads/2015/05/5-09-003-300x200.jpg)
For further reading and more detailed pictures you can visit: Nav Lense Replacement – Refurbish