Do you use CCleaner? If not, you should check it out. Not only does it clear out garbage files (temp internet, history, cookies, temp files, index.dat, etc), but you can also use it to clean the registry, delete unnecessary startup programs, or uninstall programs. And you can customize the cleanup...for example, you can uncheck the box next to cookies if you'd rather they weren't deleted.
Yes, there are various ways of doing all the above with the OS, but why go thru several steps when all you have to do is click a few times & you're done? or just right click on the recycle bin & run it from there?
IMO, CCleaner is one of the best free programs to come along in a LONG time.