Cleaning mirrors requires a bit of extra care to avoid damaging the reflective backing that gives the mirror its clarity. Improper cleaning, especially around the edges, can lead to unsightly black spots or edge corrosion, a phenomenon known as "desilvering." This issue typically occurs when moisture seeps into the edges of the mirror, damaging the underlying reflective coating. To preserve your mirror's appearance and longevity, it's essential to follow a few key cleaning practices. 

The first rule of thumb when cleaning mirrors is to avoid wetting the edges. Water or cleaning solutions can erode the mirror's backing over time, so it's important to keep moisture away from the frame and edges. When choosing a cleaner, opt for a quick-evaporating glass cleaner, such as ammonia- or alcohol-based products, which are designed to dry fast and leave minimal residue. These types of cleaners are also effective in cutting through smudges and fingerprints, ensuring your mirror is spotless without risking moisture buildup on the edges. 

Another essential tip is to spray the cleaning cloth, rather than directly spraying the mirror. This method prevents overspray from reaching the edges or pooling on the surface of the mirror, reducing the risk of moisture damage. A soft, lint-free cloth is the best choice for cleaning, as it won’t scratch the mirror or leave fibers behind. Microfiber cloths are particularly effective, as they trap dust and moisture, providing a streak-free shine with minimal effort. 

Once you've cleaned the mirror, it's important to dry it promptly. Letting the mirror air dry can leave water spots or streaks, especially if there’s any residual cleaner left on the surface. To ensure a pristine finish, always wipe the mirror dry immediately after cleaning, particularly around the edges, to avoid any moisture from sitting too long. 

These tips will help you keep your mirrors looking clear and fresh while protecting them from long-term damage. By following these simple steps, you can maintain your mirror’s clarity and prevent unsightly damage from careless cleaning.