W/ frequently visited sites, it's good to clear the cookies (as CH mentioned) as well as the temporary cache. I use System Mechanic (there are others, AISYA) which has the advantage of remembering what you have saved in the past, which speeds up the process and is much faster then manually deleting from folder. Keeping the good cookies will save you from having to re-ID yourself at most of the sites you frequent. Then I clear the entire windows temp internet cache (too much time to go through manually). All that you may possibly lose are an auto login feature here or there (which can be resumed at next visit), log-ins may be little slower during your 1st visit back.