No, sharks do not require suckerfish to stay clean. Sharks have dermal denticles, or placoid scales—small tooth-like structures covering their skin. These denticles maintain a smooth surface, deter parasites, and reduce water resistance while swimming.
While remoras or pilot fish may associate with sharks for feeding or protection, they do not play a significant role in cleaning them. Sharks regulate their cleanliness through natural processes and the abrasive nature of their skin.