Pieces of hair showed up on my Canon SX210IS. Usually when that happens for your DSLR, you remove the lens and go in from the front. For a point and shoot, I had to take off the back and go in from behind.
Under the LCD is the sensor. Three screws hold the sensor to the body.
Careful with the sensor while it is flipping around still connected by the ribbon. Look into the lens and you shall see the IR cut filter which has a green tint. Your dusty piece is there. Remove it for cleaning and return everything back its place.