Cache Cleaner for Android:

• KISS philosophy
• No ads
• Fast and clean
• Does not require root

That says it all.

You do not need this app anymore if you are on Android 6.0 or newer. Just go to Settings -> Storage & USB-> Internal storage and click on Cached data in order to clear all the cache.

Starting with Android 6.0, CLEAR_APP_CACHE permission seems to be no longer available to regular applications and since this permission is required for cleaning of internal cache, Cache Cleaner is not able to clean internal cache on Android 6.0 and newer. However, cleaning of external cache is still supported.