Need program to safely scrub free space and deleted files and parts of file

In PC world they have CCleaner and R-Wipe & Clean and a half-dozen other well-regarded programs that clean up the junk off your drive, sanitizing it while not touching the data still in use. Are there such programs with good reputations in the Mac world? What be they?

Thanks, I have used that. I'm not so sure it is as thorough as the programs I mentioned for the PC, which take out fragments of sectors, various histories, cookies, bits of remaindered programs, etc. And they are much quicker, seems to me, than the Erase Free Space in Disk Utilities to boot (even the straight write zeros is slow in DU).
So I was looking for some free or commercial products that offered a range of methods and good speed, as well as a broad range of "intelligent" pruning.

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    >
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