I am clearing the cache on my Android phone multiple times per day, to close all the Apps. It has an App called Cleaner, which clears cache, the memory, any residual files etc. Are you referring to something different?
By the way, I've packed the Melomania 1+ and I will return them tomorrow. The more I am listening to the Technics AZ60, the more I like them! I also own the Melomania 1, so I am covered. The next device I will try will be the FiiO UTWS5 when it will become available on Amazon, and IF it will be capable of driving my TRI I3 - still waiting for an answer at their thread