This float comprises a fuselage analogous to classic floats, but which here is topped by a leg such that the fuselage is completely submerged. The hydrogen peroxide is supplied to the previously heated plastic surface. The reclaiming process can be continuous or batch. A first removal preventing film is formed on the side wall of the opening and the residual film is removed at a state where the projecting part of the second film protruding from the side wall to the opening remains.