Mac, Safari cleaning cache- history & cookies problem

[RetroMonde]

Hi- I'm having a problem and thought one of our techies might be able to explain why. Long story short, because of a comcast email problem I can't sign out of my account. Their CS suggested resetting my browser, Safari is my preference. The shortcut isn't available anymore but I ended up in the cache dumping cookies. All except 3- free people, jet dot com and ebay. All say they're data mining. I don't mind eBay- that's the price I pay as a user. But FP & jet? No way. I can't get them to budge. Any suggestions or advice? Leave it or ?? I'm not much of a tech person so short words and lots of patience is appreciated. TIA!! 

[labbypaws]

Download spy BoT or adaware. Try that. You can also do a search for *.tmp and delete those files. See if that helps.

[RetroMonde]

I was wondering if it could be a virus-type thing or spy or some other uninvited parasite. (sorry eBay). I really should run a scan... maybe tonight.