Cleaning of a camera lens is only allowed with special less fluid, because the coating on the lens can easily be damaged. The coating is essential, for correct working of the lens. It corrects aberration, flairs and adds to the sharpness of the lens. fluids like alcohol must not be used. You also can buy a lens pen to remove smudges, but first read how to use it.
They come in different sizes, so choose the correct one for your lens, if you want one.
When the dark spot is on the inside of the lens you can't remove it. It could be molt and will eat its way through. Where the molt is, the coating is gone, so removing it, will change the characteristics if the lens forever.
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