Comparison with Clean My Mac 3

For kicks I ran CMM3 on my iMac and 679 MB were found and deleted. I then immediately ran Disk Cleaner, and another 145 MB were found and deleted. This may not be significant, but Disk Cleaner is much faster and (now) less expensive, but both appear to produce similar outcomes.

loupdemar about Disk Cleaner - Free HD Space, v1.1