It depends on how much dust/dirt is on the sensor. First of all I would invest in a " loupe "
to me it is one of the best bits of kit one can get and invaluable with working on a sensor. infact I would go as far as to say you can't clean a sensor properly without one, or at least it defiantely makes the job so much easier.
This is the kit I have
http://www.warehouseexpress.com/buy...erfly-724-brite-vue-sensor-loupe-7x-/p1028072
Great for light dust but for stuck on dirt then you need to go for swabs and cleaning fluid. Personally I am not in favour of blowers as they could disturb dust elsewhere within the camera body and make things much worse. If in doubt as to how to swab a sensor there are plenty of tutorials on u-tube showing how to do it.
There seems to be a big mistique about how to clean a sensor but with the right kit and watching a few videos it isn't that hard. Just remember its not a job to rush and care must be taken when working on a sensor, don't expect hard stuck on dirt to be removed on the first wipe, it may take several attempts removing a bit at a time irrespective of what is claimed. Gently does it and providing care is taken its easy.
Other on here are saying they have heard , but not got experience of, artic butterfly gets oil/grease onto the sensor, I can't understand how. They must be doing something wrong, either trying to remove stubborn dirt with it or letting it spin whilst in the camera body or letting the butterfly go to part of the internal workings of the camera body its not intended to go. There is no way there should be oil/grease on or around the sensor to that extent in the first place, if there is then there is something wrong in the camera.
The butterfly is great for removing
"and dust/hair only" I have used mine on many occasions so know it works, for anything else wet wipes is the way to go.
As Puddleduck says quote " Tried and trusted Pec-pad + lollipop stick + Ecslipe has worked for years"
unquote, have to totally agree with him as thats what I use as well for stubborn dirt.
Realspeed