Clean a Bathroom Mirror in Six Steps: Water, Soft Cloth and Dry Edges
For routine mirror care, use a wrung-out lint-free cloth with clean warm water, dry immediately and keep liquid away from mirror edges and joints. Avoid abrasive or harsh cleaners.
The National Glass Association recommends clean warm water and a soft, lint-free cloth for flat glass mirrors. Water collecting along edges can damage the backing, so spray nothing directly onto the mirror and dry promptly. Follow the product manual for coated, illuminated or electrical mirrors.