I'm wondering if that's the defect on my 09 CUSE4 fairing.
There are about six or seven of these - at first glance they look like <very obvious> watermarks where drips have dried (except the bike would have to have been on its side when the water dried, as they run nearer to horizontal rather than vertical!). They don't wash off or polish off though! The marks are actually lines of very small pores through the clear coat, (some of the bigger pores are the round dots in the photo) and you can just about see the blue being a little uneven underneath if you get the light in the right direction. I suspect they have been sags, or runs, in the blue, that have been rubbed flat before the clear coat was applied, and the blue having been thick there, the paint has not cured properly before the clear coat being applied. The defect is likely caused by the solvent in the edge of where the sag, or run, has been coming out over time. It leaves these little pores that fill with dirt and polish so the lines start to show, as in the photo.
Jim