Copperhill kit! Not easy at first and the job can be time consuming. NEVER use the same "Pad" twice!
Use a Rocket Blower first with the back of the camera facing up. Blow up using the rocket so that any stuff will fall out, then 2 drops on the Copper Hills swab, wait 10 sec or so then "Swab" your sensor using even pressure across your sensor's filter (you are not actually touching the sensor). Slide the swab to the area not touched by the pad, with out removing the tool from the sensor area, "Swipe" the other direction using the other side to your starting point. Pressure should not be more than wrighting with a ink pen. Follow up by turning off your camera and getting another Pad ready. 2 drops, 10 sec and do it again. After about 6 times, dry "Swab" once and blow again with the Rocket Blower, blowing up into the camera. After a few cleanings you will get the hang of it, and find out what works best for you. If you use canned air, not reccomended, one quick burst away from the camera then short half squezes up like the Rocket Blower. Do not shake the can and do not use the straw that comes with these cans!
Gripped 40D,Gripped 50D, Gripped 7D, 1DX, 70-200 2.8L IS V2, 400L, 600L F4, 24-105L, EFS10-22, 8-15L, 50 1.8, 85 1.8, Tokina 17-35, 580 EX II (2), EF1.4 II Extender