Dust the mirror with a dry microfiber cloth
Mix equal parts white vinegar and water in a spray bottle
Lightly spray the solution onto the cloth, not directly on the mirror
Wipe the mirror in a zigzag or circular motion
Use a clean dry microfiber cloth to remove streaks
Clean the edges and corners with a cotton swab or soft cloth
Remove stubborn spots with a little rubbing alcohol on a cloth
Avoid using paper towels or rough materials
Dry the mirror completely after cleaning
Repeat as needed for a streak-free finish