When i take a photo on my camera canon 500d there is a little blotch on the photo lens or censor. Any ideas how to fix it?

It could be due to a smear on the surface of the lens. Purchase a lens cleaning kit and follow the direction carefully to clean the smear. First, use the air blower to remove dirt and dust from the surface of the lens. This is an important first step because any disrt may scratch the lens when you try to wipe it clean. Then moist the lens tissue with cleaner solution and gently clean the lens in a rotating motion. Finally, use the soft cloth to dry the lens.

It could also be due to dust on the sensor inside your camera. Activate the Integrated Cleaning System to shake the dust free. If this does not work, remove the lens, point the camera face down, then use the air blower to try to blow the dust off and out of the camera. If this also does not work, we recommend that you send your camera in to Canon to get the sensor professionally cleaned.