Here are a few tricks. Use old newspapers or a squeegee to remove your mirror cleaner and a chamois to buff out any streaks.
Looking for a mirror cleaner you can make at home? Try mixing 1 C. (2.4dl) rubbing alcohol, 1 C. (2.4dl) water and 1 T. (1.5cl) white vinegar together in a clean spray bottle. Be sure to mark it as mirror cleaner.