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Hi EzyStyles
You can cause problems using a cottonbud if you are not extremely careful and chances are you will make things worse. After blowing off what loose stuff you can the rest can often be brushed off with a special anti static brush. I use a gadget called an "arctic butterfly" and I am very pleased with the results. So far that is all I have needed to do. Do a google search for arctic butterfly and I'm sure you will also see the alternatives as well. Unfortunately I don't know of a cheaper solution, but its still cheaper than having your sensor cleaned by a camera shop.
Best of luck
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