How to Clean a digital Camera?

My powershot pro 1 just go to full extend when I first turn it on and it woudn't retract only when I turn it off again. I really need some help here please.

Here's how to keep your camera in tip-top shape.
1. Clean the inside of your camera by opening the back and then blowing the dust out with a can of compressed air, or with a bulb tool that blows air when you squeeze. (Image 1)
2. Clean the lens by blowing any dust off with compressed air. Use a special lens cleaner and lens cloth to thoroughly clean the surface. (Image 2)
3. Wet a cloth and wring out as much water as possible. Use this cloth to clean dirt off the camera casing, making sure no water seeps into the camera's interior.
4. Use a dry soft-bristle toothbrush to clean out the crevices of your camera's casing. (Image 3)
5. Rub dirty battery contacts with a pencil eraser.