I just came back from the beach and downloaded my pictures into my laptop to check them out. Then I noticed that half the pictures had a dark mark on them, so I looked at the camera and there's a little grain of sand on the inside of the first lens. (It's not on the sensor, you can see it easily looking at the lens) I now need help cleaning it. I don't want to send it to some store since it's expensive as hell. I have ton's of experience with little delicate and complex things and I would love to try to clean it myself but have no idea how to open a lens(if I really need to do that). Could you guys help me ouy finding some info on how to clean it? Where I can get some tutorials of anything? The camera is a D70 and it's the original lens that came with it 18-70mm DX. Thanks!