I started seeing a black spot or splotch on pictures previewed on the LCD screen of my digital camera (Fuji FinePix F30). This was ruining all my pictures since the white or light-colored portions of my photographs would show this black splotch. It appears that this is due to dust on the camera’s sensor and the best “hack” to solve this problem was to use a vacuum cleaner and attaching the hose to the lens arrangement, try vacuuming the dust out.
Since I was worried about using a dirty vacuum cleaner on my digital camera, I did something simpler — I just covered the lens arrangement with my mouth and sucked on it (creating limited vacuum). And for me this worked! No black spot on my camera’s sensor any more.