Surya, its a bit tricky and you can check on here how to get to it. Once removed, you can clean it with some optic cleaner. It actually sound more like your viewfinder is out of focus. Try this first "There is a little wheel on the right side of the viewfinder that is the diopter adjustment. Look through an out of focus lens (or even take it off) at a bright light or area. Look through the viewfinder the same way that you would to take a picture and adjust the diopter until the little focus point lines are as sharp as you can get them. there is a lot more about your camera on here. Hope this helps, good luck.