I noticed lastnight the n/s headlight looks dull compared to the o/s, i've put new bulbs in today and its the same.

On a closer look with the lights off the n/s looks cloudy, The lenses are clean but it looks like the inside of the headlight were the bulb sits.

Is it a simple remove the whole headlight and clean it?

I've took a pic but on the camera it looks no different.