At long last, I can say that my sensor is dust free except for a tiny little mark on the left bottom corner that I am going to leave there for the time being. The cleaning kit arrived on Tuesday and I had ordered it on Sunday, so that is an excellent service from Quality Cameras at
http://www.qualitycamera.com.au. It took me a few attempts and some despair when at a time it got worse rather than better. I only used, as instructed, one piece of paper and about three drops of cleaning liquid at a time to avoid introducing more dust. Any way, sensor cleaning, as they say, is not for the faint hearted, specially for the first time, but like sex after 25 or 30 attempts it kind becomes almost mechanical
there I said it! So a big thanks to all of you that offered advice and set me on the learning path.