You don't need to open Clean Master to start clearing your RAM.
You don't even have to use a widget anymore!
You can choose an auto mode for Clean Master, so it will start cleaning the used up space on your RAM by its self.
In order to do this, open the application and choose the option shown below.
This way all the open applications will close and therefore clear some RAM space...except for the ignored applications! The apps that go in the "Ignore List" of Clean Master, will never close automatically. In order to manage this list you need to follow these steps.