Restoring Cloudy Headlight Lenses on 2000 Sierra Step-by-Step DIY tumblr.com

Begin by washing the 2004 GMC Sierra headlight lenses thoroughly with soap and water to remove loose dirt and grime. Once clean, use painter's tape to mask off the area around the headlights—this includes the painted bumper, grille, and any chrome trim . The tape protects the surrounding paint from accidental scratches during the sanding process. If you are working on a Sierra with composite headlight assemblies, take care to tape around the edges where the lens meets the housing to prevent water from seeping into the assembly during wet sanding.