Hi ! I own my d90 for about 10 year's now , but I am still new to it , due to my works I got no time to get around with it , and one day I found that I am taking outdoor want to take picture and found that inside my view finder got a shadow in it , after I take out my len and see nothing on it , so I try to cover it with my hand and did saw some kind of white shadow on the top of the shutter len , that one looks like plastic thing , if you looking through the len is light grey or cholate color , so I decide to use the cleaner to clean it but I couldn't clean it off from there , so is it anyone having the same problem too , is it any solution on how clean it or just leave it , I did try to take few photo and saw nothing on the picture , which mean only on that white plastic , but I feel uncomfortable with it , so hope to have someone can help here , thanks