I took Norscots advice and tried http://www.intemos.com/. I got their basic cleaning kit, sent in less than 24 hours, and had a go myself. I have a D50 and it is simple to lock the mirror up and see the sensor. I followed the instructions with the kit and it seems to have worked and no problems. I will have to get out in daylight to check again but that irritating smudge is no more.
The basic kit supplied is still not a bargain at £13 for 5 glorified Q tips and 10mls of fluid but if it does the job and saves a trip to Glasgow it can't be bad!
Just when you think everythings fine, life slaps you in the face.
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