The best thing to do is take apart the back of the TV, and wipe the bulbs and screen clean with a dust rag. If the haze persists, turn down the picture and color setting in the video option menu.
I Have Philips 8p6054 C101 Rear Projection TV With Green Haze All Over The Screen, How Do I Fix?
If you have a haze with any of the colors... Such as blues or greens, there might be some dust contamination in the bulb cannon... I have the 8p6054 c102 model, with the same problem... Tv repair shop said they can clean them for around $250...
There is some problem with the color and picture display options do check this out, but I would suggest calling the repairer as the expert person in this field should do as to avoid any further problem