Trevor. Sorry for coming in late, but on enlarging the left pic/view, I can see what appears to be a 'SCRATCH' in the lower left! (your choice what to do here!). The rest appears to be a lot of dust etc. etc....
The fingermarks & smearing need to be removed asap.
Contrary to Steve,(sorry Steve), I would remove the mirror, clean with lots of 'cellulose free' cotton buds & dishwashing liquid in fairly warm water. Have a squeeze bottle handy & a good supply of warm distilled water. I use a 'puffer brush' to aid with moving/removing the water droplets.
You may have to do this 2 or 3 times.
Do not apply any great pressure to the cotton buds tho. & only use once. Do not rotate them, otherwise the oil off your hands will be deposited on the mirror & you'll have to do it all again.
HTH.
L.
ps. Check the 'Scratch'. If it is one, then send it back with pics. L.