Stain/Substance on Driver's Side Mirror
 

I just picked up a fairly new F56 and noticed that the driver's side mirror has some kind of film on it. It looks like dried soapy water and is quite distracting in bright sunlight.

I've washed the car twice since I've had it but had no luck removing the film. I've also tried quite a bit of Windex - no luck.

Any help/suggestions are greatly appreciated. Thanks.