Use APKPure App
Get Storage Cleaner old version APK for Android
It saves space. I promise.
This app works by using an advanced and extremely complex algorithm that instructs the user to press a sequence of two buttons in order to free up approximately two megabytes of space every time the user clicks it.
Okay yeah, it's a joke. The app uninstalls itself. It still saves space though.
Github: https://goo.gl/TXNsGU