Apps that you have already deleted sometimes leave data behind.
The system constantly creates logs , crash reports and debug files you do not really need.
SD card collection of files and directories that you do not recognize .
+ The explorer is a full file manager , use it to browse your files Android .
+ You can use the Searcher if you know which file you are looking for.
+ The RechCadavres looking on your device orphaned items and compares them to the list of installed applications.
+ The ContrôlApplis lets you freeze , reset and remove applications (even system apps ) .
+ The NettoyeurSystème scans your device and filters directories with unnecessary files. You can even create your own filters !
For More Info Google Play