Nikon d3000 camera issue with certain part?

Ok, so my nikon d3000 has ben working perfectly but recently the part where i look to take a picture is blurry. The lens is perfectly fine. I tried to wipe down the inside(with the towel nikon suggests) to see if that was the problem but nothing happened. My pictures also come out blurry. What do i do?

If your photos come out blurry, then the problem is not with the viewfinder. There's either a problem with the lens or the focus. Are you using auto focus? If so, switch to manual focus and take a photo of something nearby like some books after focusing carefully. If the photo comes out clear, them there's a problem with your camera's auto focus.