There are 2 methods to download CCleaner for Android onto your device:
On the Device itself:
- Tap "Play Store"
- Search "CCleaner for Android"
- Tap the result that appears, and tap "Install"
On a Computer:
- Open your internet browser and go to this link
- If prompted, sign in to your Google Account
- Click the "Install" button, and CCleaner for Android will be installed onto your device