How to clean out junk on a mac?

I notice a TON of stuff on my mac I have never even seen, and I wanted to know if there was a program to scan your computer for crap and clean it out?
Thanks

There are many programs that claim the ability to do what you describe, but none of them can do it safely or reliably. They're all junk as shldr2thewheel says.
Ideally, you should know what you're installing before you install it, and know how to remove it as well. Most programs can simply be dragged to the Trash but some (generally, those that require a user name and password to install) require using their accompanying uninstallers to ensure all its remnants are eradicated.
If a program does not modify OS X, or is not configured to launch when you log in, it's just taking up space and can be ignored. Files, folders, music, pictures, and similar work that you create are not programs and can be deleted if you no longer need them. However, if a program installs kernel extensions, "daemons" or other running processes it can have detrimental effects on your Mac's operation.
You can use a little program written by Apple Support Communities contributor Etresoft to create a quick summary of the latter category as well as other system details. It does not delete anything, it merely reports what system modifications are running or installed and can be helpful in determining what may be burdening your system, so that you can decide what to do about such programs rather than delegate that task to some ill-conceived junkware. Read about it and download it here: http://www.etresoft.com/etrecheck.
Etrecheck itself is tiny, and when you're finished with it, can be left alone or dragged to the Trash as you wish.

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