There are some common misconceptions regarding the requirements for cleaning and maintaining your mirror.
The first common misconception is that the best way to clean your mirror is with a window-based cleaning product. The issue with this is that these products contain a chemical which reacts with the backing of the mirror.
The backing of a mirror, otherwise know as the silvering, contains numerous layers. These layers form the silver backing on the mirror and provide its reflection. The chemicals in the window cleaning product are then sprayed and rubbed along the edge of the mirror and this chemical is prone to eating into the layers of silvering.
For best cleaning results we recommend using a mix of methylated spirits and water at a rate of 30% methylated spirits and 70% water.
When cleaning the mirror avoid getting water on the sides or back of the mirror or ensure that you dry any additional moisture during the cleaning process.
If you live in a coastal area it is recommended to wipe the edge of the mirror once a month to avoid salt build-up. Similar to the chemicals in the cleaning products, the salt can eat away at the silvering on the back of the mirror.