Swirl marks are the spiderweb looking scratches you see on your finish when you follow the beam out of the light of the sun outside or use a flash light or LED lamp to look at your paint. These are caused by improper wash technique and the reason you can't see them in your garage or in the dark or sometimes even outside is because usually most people don't know how to look at their paint properly to see them. Swirl marks come from pushing dirt and dust around the clear coat using dusters, dry wiping, washing with poor quality towels, wash mitts, quick detailers when the surface is too dirty, touching the paint with your shirt or finger, and so many other things. Swirl marks are inevitably going to happen no matter what but you can reduce them with proper wash technique after purchasing paint correction for your vehicle. Wicked Auto Films and Detailing will provide you with proper instruction.