I cleaned the system with CCleaner with all the options enabled under ‘Windows’ and ‘Applications’ tabs except Wipe Free space option, and then I ran East-Tec Eraser. East-Tec Eraser was able to find an extra 47MB junk in the system.
Every system cleaning tool will find something different, the same with registry cleaners which is why some people use multiple cleaners.
It appears to compare apples with a tribe of orangutans
One image shows that CCleaner found 0.41 MB of UN-deleted files to wipe,
whilst the other identifies 260 targets and displays only registry keys,
and at the bottom it appears to be trying to "Stop Software Recovery Tools",
which to me says it is wiping already deleted files,
and that I believe is the province of Recuva and not CCleaner.
Just downloaded it and gave it a cursory look. It's a 15 day trial, permanent version costs about 40 bucks.
Installed it but didn't let it finish its run. Just don't need it. Only installed it because I knew that Powershadow will get rid of any remnants after a restart.
No harm in looking, I guess, as long as I don't get into trouble for comparing a competitor's software. Some forums get really cranked up about that, but Piriform seems pretty easy going.