Re: Can they still check what I’ve been on?
General areas of caution:
temp folder (clean it out), some files will not delete and that is fine, you can skip them.
clear browser history/cookies/cache
clear “Recent Items” list from start menu bar
and last but not least, empty your recycle bin after you’ve deleted all the above.
This is all cost-free and fairly quick. Also, it’s always a good idea to create secondary accounts for any additional users as Guest.
You can also get this little utility CCleaner. It does all the above for you, including some extra functions like registry cleaning for any outdated tracks.