I have been cleaning sensors for years now, the best method I have found is get the delkin SCOPE throw the swabs and fluid in the bin.
Get some Kim wipes and a pair of hard rubber tipped tweezers, in some cases you may need a few drops of pure alcohol.
in many cases the dust can be simply blown away using a very good blower, do not use canned air or anything similar use a squeezy blower.
for the more baked on bits you may need to use a kim wipe.
I have heard so many horror stories about people using the swabs, my good friend actually scratched the filter on his 1Ds3 cost £1k to have it replaced (they only sell the unit as a whole)
it is easy enough. if you can get to Herts I would be happy to show you how to do it, I will do your FF camera and then you can have a go yourself on the crop body.
Let me know what you think.