BleachBit is the only open source alternative to CCleaner, but unfortunately it is a substantially big piece of shit.

http://bleachbit.sourceforge.net/

Some of the most infuriating annoyances:

Retardation. I want "winapp2.ini"updates, but I do not want updates to your shitty software.

Only shitty software needs monthly updates (yes, Google Chrome including).

Dialog Boxes. Lots of them. FFS.

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