Clean-up is a general term for a various compositing techniques used for finishing shots in post-production and for removals of unwanted objects, phenomena and artifacts.
Clean-up techniques include:
retouching – a frame-by-frame artifact removal through painting over the parts of the image. For example: removing stunt wires, ropes, unwanted logos, contemporary elements on historic building, etc.
rotoscopy – masking out wanted or unwanted artifacts with hand-drawn or automatic outlines for compositing purposes