Interesting to know that ants can fake death.
It is not advisable to touch the sensor with foreign objects as they are very fragile. To remove dust, I simply change the setting on the camera to BULB mode and use a blower to blow the sensor area while I depressed the shutter release button (this will lift the mirror and you will be able to see the sensor) at the same time. When you done, make sure the blower is not in the way of the mirror when you remove your finger from the shutter release button. Try not to turn on the air-con or fan when you doing this as they may cause more dust to land on the sensor. Shoot at a plain coloured wall and check through the computer monitor for signs of dust. Try the blower method gain if the dust is still there. If there are stubborn stains, bring it back to the agent to clean it for you. So far, I am able to remove dust from the sensor using the blower method. Of course, it is equally important to take steps to minimize dust going into the camera while in the field.
Happy shooting!