I also have a 2014 and noticed the same problem last year, especially on the driver's side exhaust. I now use Simichrome Chrome polish on this area as soon as I start to see the rust (usually every 2 weeks) and have been able to keep it under control. It still looks like new with regular polishing.
The problem is worse during the summer months when it's warm and humid and goes away in the winter.
I also use Fein Multimaster
https://www.amazon.com/Fein-FMM-350Q-201...ein+multimaster and some felt polishing pads
https://www.amazon.com/Fein-63723032010-...+polishing+pads, which saves a lot of time instead of buffing the rusted area by hand. Usually only takes me a few minutes to clear up the problem and get a mirror shine with this.
