Just had an eye opening experience that I wanted to share. We have a steel bridge near us that we use regularly. It's the kind where the beams and triangulation are above the roadway, and it's old, so it's narrow. You drive up onto it to cross the Napa River, hopefully don't meet traffic, then down on the other end. I was driving across at about 30 mph, when at the other end, a pickup pops up and onto his end of the bridge. Mentally, I know I can pass him, but it's tight-ish. I'm fine until just as he passes me, and I involuntarily twitch away from his truck -- and my passenger mirror WHACKs into the girder uprights. Ouch. The mirror flicks back to it's folded position so fast that the glass pops out, hits the window, and splinters, but is held together by the backing. I get out to check the damage. The mirror housing looks terrible, horribly scratched, old silver paint streaked along, ripped surface. I beat myself to death until I get home and can look at it. I remember I had the mirror housings covered with 3M PPF. I find an edge, and pull it off. It's thicker than I imagined, and really stuck on. But it comes off. The scratches seem to be all in the plastic, so after the film is mostly off, I gently work and rub the plastic remains off the cover. Remarkably, the painted cover is not dented, not scratched, not damaged. All I need is a new glass replacement, and they just snap in. And I plan to get a new PPF installed on this mirror!