A small amount of dirt on the lens would just produce some flare and redule overall contrast slightly. It wouldn't produce a grossly out of focus image. Either you misaligned something or you messed up the autofocus system somehow. Can you focus the lens manually. Many consumer grade digital cameras allow you to set the focus at some specific distance. Do that measuring the distance carefully, and see if the image is still out of focus. Digital cameras tend to have a lot of depth of field, so there must be something seriously wrong with the mechanism.
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