Sorry for the lack of response lately and it is either they are busying on the coming VL7 official release or busy preparing for the up coming 4th of July
BleachBit require below dependencies to work
* Python version 2.5, 2.6, or 2.7
However: Python version 2.4 and 3.0 are not supported
* PyGTK version 2.14 or later
VL6 is currently using PyGTK-2.12 and it does not meet the minimum requirement. There is a bleachbit package for VL7 and VL7 is coming out soon you might want to try that. Currently VL7 is at RC2 stage and will soon to be announce stable.