I got this error:
(bleachbit:5510): IBUS-WARNING **: The owner of /home/niider/.config/ibus/bus is not root!
It is not an error. It is just a warning related to using sudo. If IBUS (input method for multilingual input) is working, then do not worry about it.
The interpretation is that you are running as root but accessing niider's file. This is a mismatch. Again, this may be harmless.
For BleachBit 2.0 (alpha due soon) I am using pkexec instead of sudo, so that may help.
sudo -H bleachbit
to avoid such warnings – Zanna Jan 24 '17 at 10:25