How to hide or clear unread badges on Gmail folders in Mail.app? This isn't a new problem with OS X Mail, it persists into Mountain Lion. 



The badges are quite obnoxious; I can go into that [Gmail] folder and right-click and Mark As Read. But they start piling up right away again.

Is there a way to never have a badge beside any non-Inbox folder, or have a way for Mail to automatically clean up?
Create a filter in Gmail (web settings) to automatically mark all spam emails as read.