This SD_dreck is a Work in Progress new dirt file for the FBW, by default it uses the dirt textures from the MAN SD buses, however due to the way the windows were made the SD_dreck texture comes out blocky and ugly looking. This new SD_dreck is to replace it.

Please be sure to make a backup of the old file or any SD_dreck that you may have modified yourself incase this one doesn't suit your fancy.