How can I clean out chronically plugged up nostrils? *included pic*

She has always been very congested in her head ever since I got her over a year ago. Has had troubles breathing but no other signs. This week her eyes have been squinty and she'

s acting kind of off but her chest sounds ok.

How can I clean up her nostrils so she can breath easily?

As you can tell in the picture, they are almost completely plugged up. Poor girl