A camera arm (16) for a vehicle mirror replacement system includes a housing (22) having an exterior surface (38). The camera arm (16) also includes a camera assembly (32) that is mounted to the housing (22), the camera assembly (32) having a lens (34). The camera arm (16) further includes a peripheral wall (36) extending from the exterior surface (38) and at least partially circumscribing the camera assembly (32). The camera arm (16) also includes a discontinuity (41) provided on the peripheral wall (36), the discontinuity (41) is configured to create a high pressure region (PH) near the lens (34) that encourages debris (52) to migrate away from the lens (34) in response to a fluid flow over the peripheral wall (36).