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Its not hard Alex. Take a shot of the same length of time but with the lens cap on. Copy that image and paste it over the first in photoshop. Then in blending options select difference and then flatten in the layers menu. Done.
There are other ways of doing it, but I find that a very good option for a quick fix. Before you flatten check to make sure the whole image has the hot pixels removed (covered), if not use the move tool or transform rotate to line them up.
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