"Streak-Free" refers to a cleaning result where surfaces, such as glass or mirrors, are left without any visible lines or marks after cleaning. This is often a desired outcome when using cleaning products, as streaks can detract from the appearance of the surface and indicate that it has not been cleaned properly. To achieve a streak-free finish, many people use specific cleaning solutions or techniques. For example, using a microfiber cloth or a squeegee can help remove dirt and moisture without leaving streaks behind. Products labeled as streak-free cleaners are formulated to minimize residue and enhance clarity on surfaces like windows and shower doors.