My car isn't a year old and my rear brakes are already rusting.

What is your question?

I bought my car in March of this year and it has 15,000 miles on it. I've been told that my rear brakes are rusting it's not covered under warranty and it's due to the elements of WA state and the fact that they are rear drum brakes. I've had drum brakes before and haven't come across this. What can I do about this?