SD Maid Pro – System Cleaning Tool SD Maid – System cleaning tool is a free app for the Android by darken which will clean and can regain precious memory of your Android phone. SD Maid is intended for rooted devices which is an app that can tidy up your Android device with a list of tools that can help your Android function better and faster. The app is simple enough to use and can also optimize and shrink bloated databases to speed up access and free up space. DOWNLOAD I am using SD Maid since last year and believe me it is one the most amazing cleaning tool. Far better than clean master other cleaning apps. A must have app for every android users. Give it a try and post your review. Enjoy.