OK thanks, I will give that a try first. My local Canon dealers quoted £59-99 for a kit or between £20 & £40 for a sensor clean. Had the sensor clean been around £20-00 I would have said yes.
I had some dust on my D50 sensor and didnt want to spend too much.
Tried a Rocket Blower - didnt work but then bought a SensorKlear pen from 7dayshop.com for £3.99
Tried the SensorKlear the first time but I think I was too timid and it didnt seem to work.
Tried the SensorKlear again the next day and applied a bit more pressure - and hey presto no more dust on the sensor!
Note that I am fairly new to DSLR and was very nervous doing this - I actually had the pen for over a month before I finally tried it - but I will definitely be using the SensorKlear again in the future.