Mirror never caught on with little hair wax then rinse well and dry rubbing.
To prevent fogging of mirrors it is recommended to rub it in with a detergent or shaving cream.
Mirrors or glass clean?
Rub with a clean cloth, possibly some clean agent and then cleaning and dry with an old newspaper. Spotlessly and shiny result!
Do not clean the sink with Viakal or similar means clean as a mirror hangs above because over time the mirror is ugly (looks like the weather is in it) by the fumes coming out viakal. I am told by bathroom shop.