A cleaning vehicle for cleaning a surface of an object comprising: - first and second carriages (102, 104); - first and second wheels (108, 110) coupled to the first and second carriages (102, 104), respectively, for placement along a top surface of the object; - at least one motor operatively coupled to at least one of the first and second wheels (108, 110) to define a drive assembly; - a cleaning element extending between and being supported by the first and second carriages (102, 104); - third and fourth wheels (116, 118) extending below the first and second carriages (102, 104) respectively; and - a first adjustable couple that is coupled to the first carriage and a second adjustable couple that is coupled to the second carriage, wherein the first adjustable couple defines a first spacing between the first carriage and the third wheel and the second adjustable couple defines a second spacing between the second carriage and the fourth wheel, the first and second spacings being sized to receive at least a portion of the object to position the vehicle on the surface to be cleaned; wherein - the cleaning element is disposed on one side of an axis passing centrally through the first and second wheels (108, 110) and spaced therefrom by a first distance; - the third and fourth wheels (116, 118) are disposed on an opposite side of the axis and spaced therefrom by a second distance; characterised in that: - the first and second adjustable couples (120, 122) each comprise a first frame member attached to the respective carriage (102, 104) and a second frame member to which the respective third wheel or fourth wheel are connected, wherein supports (128, 130) extend between the first and second frame members (124, 126) and can be adjusted thereby adjusting a distance between the first and second frame members (124, 126), causing the third and fourth wheels (116, 118) to move with respect to the first and second wheels (108, 110) respectively, such that the movement of the third and fourth wheels (116, 118) results in the raising or lowering of the cleaning element with respect to the surface of the object. - first and second carriages (102, 104); - first and second wheels (108, 110) coupled to the first and second carriages (102, 104), respectively, for placement along a top surface of the object; - at least one motor operatively coupled to at least one of the first and second wheels (108, 110) to define a drive assembly; - a cleaning element extending between and being supported by the first and second carriages (102, 104); - third and fourth wheels (116, 118) extending below the first and second carriages (102, 104) respectively; and - a first adjustable couple that is coupled to the first carriage and a second adjustable couple that is coupled to the second carriage, wherein the first adjustable couple defines a first spacing between the first carriage and the third wheel and the second adjustable couple defines a second spacing between the second carriage and the fourth wheel, the first and second spacings being sized to receive at least a portion of the object to position the vehicle on the surface to be cleaned; - the cleaning element is disposed on one side of an axis passing centrally through the first and second wheels (108, 110) and spaced therefrom by a first distance; - the third and fourth wheels (116, 118) are disposed on an opposite side of the axis and spaced therefrom by a second distance; - the first and second adjustable couples (120, 122) each comprise a first frame member attached to the respective carriage (102, 104) and a second frame member to which the respective third wheel or fourth wheel are connected, wherein supports (128, 130) extend between the first and second frame members (124, 126) and can be adjusted thereby adjusting a distance between the first and second frame members (124, 126), causing the third and fourth wheels (116, 118) to move with respect to the first and second wheels (108, 110) respectively, such that the movement of the third and fourth wheels (116, 118) results in the raising or lowering of the cleaning element with respect to the surface of the object.