Taken from SensorKlear Guidelines

Before using the SensorKlear, pat it onto a microfiber cloth several times to remove excess graphite and any dust before using it on the sensor. You can also pat it in between sensor sweeps. Note: To help ensure a clean tip, do not reuse a LensPen SensorKlear on the sensor - use a new one each time.

Raise the mirror so that you can access the sensor. Be sure to use a fresh battery and to follow the directions in the camera body manual carefully.

Hold the camera firmly in your non-dominant hand and point it so that the opening on the front of the camera faces down about 15-30 degrees.

Use a large bulb blower (see our Hakuba Super Bulb Blower) to thoroughly blow loose dust off of the sensor. Do not insert the tip of the blower past the front of the camera. Continue to hold the camera firmly as you work. Be careful not to jab the inside of the camera with the tip of the blower. It is important to get the loose dirt out first because you don't want to be cleaning the sensor surface with grit under the SensorKlear.

Hold the camera, again in your non-dominant hand, about a foot (30cm) away from your body at about chest height. The opening on the front of the camera should be facing you. Do not hold the camera close to you and look down into it.

Insert the tip of the SensorKlear into the chamber and place it in the center of the sensor. Begin to rub the tip of the SensorKlear back and forth on the sensor. Work from the center to the edges and then finish up by going around the edges.

Repeat: Use a large bulb blower (see our Hakuba Super Bulb Blower) to thoroughly blow loose dust off of the sensor. Do not insert the tip of the blower past the front of the camera. Continue to hold the camera firmly as you work. Be careful not to jab the inside of the camera with the tip of the blower.

If the sensor is still dirty or very dirty after your first pass with the SensorKlear, or if you have one or two stubborn dust spots that resist your best efforts, it is most likely because you have neglected cleaning your sensor for too long and the dust has become stuck to the sensor. Use approved wet cleaning method or send to manufacturer fo cleaning.