My phone's /data storage is getting fuller all by itself even though I have not installed much apps. By doing some search on net have found that there are folders under Data folder such as tombstones, thumbnails etc. which are taking up the space but which are not accessible without rooting. I want to clear up this space without rooting the device.
My device is a Sony Xperia L running Android 4.1.3 Jelly Bean)