An apparatus includes a carriage, platform, extension member, brush tool member, brush tool, and controller. The carriage is coupled to and moves along a track. The platform has a length orthogonal to and greater than its width and transverse to the lateral direction when in an operational state. The platform pivots such that its front and back ends move vertically in opposite directions. The extension member is movably coupled to the platform and its longitudinal axis is parallel to the platform's length. The back end of the brush tool member is coupled to the front end of the extension member. The brush tool is coupled to the front end of the brush tool member. The controller configured moves the extension member towards the front end of the platform such that a portion of the brush tool extends beyond the front end of the platform.