Hull cleaning is an important part of the overall maintenance of your vessel and simply makes for better performance. Cleaning of the hull is a process whereby fouling is removed with the help of different underwater cleaning equipment. This process should be ideally carried out by trained persons. It is common knowledge that fouling on the hull of a ship can increase hull friction and slow down your vessel. This can make your vessel slow and difficult to maneuver. Source: https://www.barnaclebusters.com/services/underwater-yacht-maintenance/