Cleanup Kali Linux Live Persistant USB

Hello friends!
I got a problem. I made a persistant usb stick and in begining i was using 120 MB of the persistent partition. After a major "apt-get update && apt-get upgrade" and installation of pyrit(ati drivers+CAL++ and calp) I lost almost 2.5 GB of space. I cleaned apt with "clean" and it solved the problem partially.
My main question is that in the persistence partition i got this output to "du" command:

Code:

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root@kali:/lib/live/mount/persistence/sdb2# du -h --max-depth=1

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Output:

Code:

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848K        ./boot
16K        ./home
17M        ./lib
32K        ./tmp
1.5G        ./usr
97M        ./root
1.2M        ./etc
1.3G        ./.wh..wh.plnk
856K        ./sbin
691M        ./opt
16K        ./lost+found
4.0K        ./.wh..wh.orph
169M        ./var
4.0K        ./lib64
3.6G        .

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So,what can i clean? I thought to wipe out "/opt/AMDAPP" folder and this ".wh..wh.plnk" thingy.Any other ideas ?!?

You could install Bleachbit, it's like CCleaner for Linux. Be careful with it though!

How-to:* REMOVED*

If you use it correctly, it should clear a considerable amount of space