A free app for Android, by Xiaomi Inc..

This free app is a lightweight utility that lets you perform some simple cleanup tasks on your device. The app can help you free up some storage space by removing junk files and other cache items that take up a lot of your device’s memory. 

It can find and remove files that are generated by your applications and games. It can also find photos that are taken by the app and are not necessarily stored in the device’s memory.

There is a simple and intuitive interface, so you don’t need to spend much time to learn how to use it.