Cleaning the sensor of a digital SLR camera is not difficult but you must use care and the right tools.
To remove dust from your sensor you need two items:
Use the “sensor cleaning” menu command on your camera. Blow in the sensor chamber, use the brush, then blow again. Hold the camera upside down as much as possible to help dust fall out. Leave the mirror up and the lens off for as short a time as possible. When you’re done cleaning turn off the camera and put the lens back on.
If you have moisture spots etc. that need to be wiped off use the Vivibledust Swabs.
If you change lenses frequently or go to places with fine, blowing dust you will need to clean your sensor frequently, every 2-3 lens changes at minimum.