What is the most logical next event?

How to clean mirrors
Assess the condition of your mirror.
Depending on the location and use of your mirror, it may have accumulated special kinds of grime that need specific cleaning agents to remove. Limescale or calcium deposits are likely culprits, and should be pre-treated before you tackle lesser stains.

OPT:
--You can : Identify calcium deposits by white, slightly rough textured spots. These can be removed by white vinegar on a damp cloth..
--White-or wax-based stains tend to be easier to spot than brass or copper stains, but you should never leave the mirror polished. Ideally, your mirror should appear spotless..
--If the material of your mirror reflects sunlight, washing it with a water-based detergent should be safe for the mirror. Darker colors won't mesh well with darker finishes, so take it to an oil-based " should " or " ought " cleaner..
--If more severe stains are present, such as one that won't lift, then your best bet is to hire a professional to clean them for you. By doing so, you'll also be able to figure out what's causing them..
You can : Identify calcium deposits by white, slightly rough textured spots. These can be removed by white vinegar on a damp cloth.