DIY sensor-cleaning, whilst some may argue is "dangerous" (yes, somebody did scratch his S3 Pro sensor doing so!), is probably a much easier option for those of us who wish to spare the hassle of making a trip to the service centre during our working days. It is also probably one of the favoured options for those of us who use our cameras heavily (like daily).
This is a simple guide to show what are the tools at our disposal and how to prepare them for use. I shall refrain from showing the actual cleaning exercise here as it is already extensively covered elsewhere on the web.
Fujifilm and Nikon service centres, use similar tools, though some may not refer to their tools by the same name. Nonetheless, do remember that this is JUST A GUIDE. Constructive addition of knowledge is most welcome, in a non-judgemental form, thank you. Yes you have Visible Dust and sensor brushes and all sorts of other stuff, but I'll just illustrate using the tools I use.
To start things off, you have Sensor Swabs, perhaps the most well-known of the tools. Easily available at Cathay Photo (no I am NOT affliated to them), but the most costly of the tools. A box of which contains just 12 swabs. Do your sums.
You will need a cleaning solution, here we shall use the Eclipse solution, costing $18-20 a bottle from Cathay.
Here you have Pec Pads. Cheap at the price, in a packet of 100 pieces.