Nikon D300 sensor cleaning

I have no idea how the sensor can get this stubborn dirt stick on it. Tried many time using the built in sensor cleaner, it just wont work. I had event expose the sensor and blow air...it doesn't work.


So today I brought my D300 to Nikon SC in Petaling Jaya. Since its still under warranty..the work is FOC. See how clean is the sensor...dammed Im just so happy!