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Apps you have already deleted, sometimes leave data behind. 
The system constantly creates logs, crash reports and debug files you don't really need. 
Your SD-card is collecting files and directories you don't recognize. 
Lets not go on here... 
Why not get a maid to clean it all up? 
SD Maid will help you keep your device neat, clean and tidy :-)! 
Give it a try, you won't find a more thorough cleaning tool! 
Choose a tab, press start and then either click a single item to delete or press the clean all button. It's just that easy. 
There are various features available: 
* Explorer is a full fledged filemanager, use it to crawl through your Androids files