I had pretty good luck cleaning my Nikon D70 sensor with Iso-propyl alcohol. I believe it was 97%, or reagent grade, which means there is little water. Get it from a druggist. Standard bottles of this stuff is often 40% water and will not work very well. I used lint-free tissues, which still leave lint behind. I wrapped the tissues around a piece of thin wood that I cut myself to be the width of the sensor. This was important. You must swab or clean the entire surface in one pass. If you use a narrower swab, you will always have lint left along the path of the edge of the swab. Use a minimal amount of alcohol on the swab, not dripping! Do not risk getting a flow of cleaner behind the low-pass filter, because then you buy a new camera. Keep replacing the tissue until the sensor has no more lint on it.

Test by shooting up at a clear sky focussed far away and at a very small aperature. Spots will show immediately. Re-clean until you are satisfied, which might take 10 testing/recleaning cycles.

You will really appreciate your next camera with cleaning built into it, as did I. I made a series of 25 small photos with instructions on them describing my entire process, but I can only attach one at a time here, so if you want to send your email adress to me at wordcycling@hotmail.com , I will send the set to you. It totals about 3 MB.

Wayne