Just go get a lens pen and clean it. if you are referring to really dirty like mud or something along this line, use a lint free cloth, wet it , squeeze into a damp(not soaking wet) cloth and clean your lens gently.
A few speckles of dusts inside the lens is normally fine. They don't affect the quality of the photos. If you are concerned, bring down to your camera's manufacturer's service centre for cleaning.
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