​​Android Cache Cleaner

Since Android 6 (Marshmallow) no longer allows clearing the cache of all applications at the same time, Google has moved this permission only to system applications. 

There is only one possible way left - to manually open the application information and find a specific "Storage" menu, and then click the "Clear Cache" button.

Android Cache Cleaner can query all installed user and system applications and performs all manual actions related to clearing the cache.

Android Cache Cleaner can also be configured to clear the cache of only certain user applications.

F-droid: