When I use the application manager, I see that 1.8GB are occupied out of 2GB available. This of course causes issues when installing apps and brings up a warning notifications that some system services may malfunction. However, if I sum the memory taken by my apps, I come up at 1GB, and many of these apps have been moved to the SD card.
I've tried to use Clean Master to free space, but without much success.
So I want to cleanup files manually. What partitions on the phone's system are the ones in the 2GB space? Is it the root partition?