Or, you can embellish the mirror. Is the frame ornate or country? If you look at the mirror from across the room, what do you see?
Could you enhance with some lace, fabric, buttons, or glass paint and faux metal work?
If it's not the large wall kind, can you make it into a serving tray for tea cups, jewelry, or to display a collection?
If you love the item, you can fix it. There is no reason to get another mirror unless you break it. If nothing else, give it away and someone will be thrilled to have it.
Black spots on the edge of the mirror may be because the mirror is losing the silver on the back of the glass. This is common in old mirrors. It shouldnt have anything to do with what you use to clean the glass, unless what you use in getting onto the back of the mirror. The loss of silver may or may not progress. It is hard to say. It may be repairable but I have not had any experience with that.
A mirror is glass with a silver coating on the back of the glass to give it reflective qualities. When the silver backing fails you get black spots or streaks. Nothing you are doing to clean the front is causing the problem. You need a new mirror.
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