Ok I worked on the tail gate and back window. used 3m rubbing and polishing compound on the glass to get out the tuff water stains and used it on the tail gate too. well the glass came out great but the tailgate did not improve, it was dull or cloudy. brought out the Glare spider compound and mirco polish and the tail get came out like glossy glass. I must admit Glare products does work well just wished the polish would hold up to the 5 year claim