Get yourself a decent Lens pen 13mm is good, and put your camera on sensor clean and give it a good wipe from side to side and then up and down and around.
It works a treat, been doing this to my Canon 5D forever, the sensor filter in front of the sensor is very tough and you will not damage it.
Don't be afraid of it, it will be all good, Canon just tells everyone not to touch the sensor and in fact it is a load of crap, they are just covering their, you know what
Leon
