How to REALLY close apps

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http://androidforums.com – Some apps continue to drain the battery even after it is closed. For example, I have the app Wikitude showing up as sucking up 12% under Settings -> Battery. I did the hold home button 2 seconds and swipe app to right side to close. I also tried closing the app with the task killer app Advanced Task Manager. I even went to Settings -> Application Manager to click "Force stop" on the app. I restart the phone and still the app continues to suck on the battery. This is also the case for many of the apps I downloaded. Is there a way to really close apps? (General)