Well, let me say this:
Cookies stores data specific to web sites you enter, if left
accumulated, they are a goldmine of information for when your
system is compromised by a spyware, a trojan, or simply accessed by
a Hacker.
Files in Temp Folder can fatten over time, while Temporary Internet
Files are a great place for viruses, spyware and adware to
linger.
What you think? Clear em or not?