Boost & Clean: Phone Speed Up is a free utility for Android devices that will help you speed up your phone by removing junk files, clearing the cache, and optimizing the phone's RAM. All of this can be achieved by simply downloading and installing the app on your device.

Once you have installed the app, you will be presented with the main menu, where you will be able to choose from the available options. There is a button for "Clean", which will prompt you to choose the type of junk that you want to remove. You can choose from three different types of junk: the cache, the temporary files, or the old databases. After you have selected the type of junk that you want to remove, you will be given the option to choose the exact files that you want to remove. Once you have selected the files, you will be given the option to "Remove".