In order to clean the cache partition on your phone, first of all, press and hold the Power button for a while and then select the Power off option to switch it off.
Afterward, press and hold the Volume Up key together with the Power button and hold them until you can see the Boot Mode.
On this screen, use the Volume Up button to scroll and the Volume Down button to choose the Recovery Mode option.
Next, you will have to tap on the Power button to open the Recovery Mode and skip the Android image.
There you will have to use the same key combination to navigate down to the Wipe cache partition.
At this point, tap on the Reboot system now option to restart your device.
Awesome! Now you know how to clean the cache on your AZUMI A50.