Surface cleaner lines generally come from improperly overlapping the surface as you clean it. Specifically, parts of it are getting cleaned twice, and the rest of the surface isn't getting quite as clean. This can be a problem with your technique, pre-cleaning method, or a mechanical issue. You may need to speed up or slow down until the surface is cleaned equally. Slowing down is the solution much of the time. Pre-treating with a cleaner can help, too. You may have to experiment with cleaners to find the right one for your surface. If your technique is good then lines may be from misaligned nozzles, the surface cleaner not sitting flush against the surface, or other alignment issues. These would make the cleaner not clean all of the surface's area equally.