Breaking a mirror can cause years of bad luck - hide the mirror. Round mirrors are best. Other people may be able to see inside your head upon looking at your mirror image. My folks were superstitious foreigners and impressed me with their factual knowledge of bad stuff that happened to those who flouted olde traditions.
Ever look into two opposing mirror images that get smaller & smaller? This makes me uneasy.
I clean my mirrors with cheap Walmarte glass cleaner.