Need help ! How to clean the storage of my android phone?

[luciababy]

My android phone is getting slower and slower, and my friends told me that I need to clean my phone storage,

 

I deleted the photos, music, and books and everything that I can delete,

 

but the storage still shows occupied a lot,

 

there are a lot of system files,

 

but I don't know which part can be deleted and which part cannot be deleted, 

 

I fear that I android phone will not work anymore if I deleted some essential files.

 

Anyone can give me some useful idea?

 

[Muhammad]

hey man,  you don't have right to delete the essential system files. 

[AnnieChow]

Reinstall it.  And you can move the media files out of your phone, like music, videos. photos. And you can also use cleanr for android tool to clean the data from your phone.

Edited August 12, 2016 by AnnieChow

[Kolpoiu]

Maybe you can try the Android cleaner tool. It will help you clean the junk files like app caches, app temp files, cookies, crash logs, user storage files, download temp files, photo cashes, etc. 

Edited August 12, 2016 by Kolpoiu

[yishiduli]

You can clean the storage of your android phone by using Android Data Cleaner program, which enables you to clean up all unwanted files from Android devices within simple clicks! Just google it by yourself. 

Edited August 12, 2016 by yishiduli

[kellyiee233]

Maybe you'd like to factory reset..