Focus on the exterior:
Dirt left on the outside of your camera can make its way to the inside of your camera in no time, so we recommend wiping it regularly with a clean, dry cloth. A blower brush is another accessory which is handy for removing surface dirt, however, any household cleaners and liquids should be avoided altogether. Lens caps, lens hoods and other removable parts can be washed if necessary.
To avoid dirt or dust making its way to the inner parts, you should make cleaning the exterior of the camera the first step of your cleaning process