Dear Sir,
I know that there are a lot of switchers from Windows to Mac O.S that are used to work with Ccleaner to keep our sistem Windows clean.
Even Mac users says that the S.O. is good enough to have it clean os uselees files, I am nos so sure.
Searching on the net there are a lot of forums asking for a Mac Ccleaner or similar, but the answer is besides Onix, there are no other program.
Maybe you can offer Mac progremmers to join your team and start working in that project. Most of us will than you for that.