Adjustable marine drive system with automatic cleaning

A drive system for a marine vessel comprising a first housing fixed to an opening in a hull of the marine vessel, and a drive unit arranged inside the first housing, where the drive unit is provided with a second housing comprising a drive motor and a marine propulsion system attached to the second housing, where the marine propulsion system comprises a leg and a hub provided with at least one propeller, where the drive system comprises an adjustment mechanism arranged to adjust the position of the drive unit in the first housing, where the drive system is provided with a parking position in which the marine propulsion system is positioned inside the first housing and a drive position in which the marine propulsion system is positioned outside of the first housing, characterized in that the drive system is provided with a programmable automatic cleaning sequence in which the drive unit is moved from the parking position to the drive position and back to the parking position at least once when the marine vessel is parked with the drive unit in the parking position, where the cleaning sequence is adapted to mechanically clean the inside of the first housing from the movement of the drive unit from the parking position to the drive position back to the parking position.