If you do, 237SJ make sure that you know all your passwords because CCleaner will wipe them out and when you need to visit a site that needs a ( your ) password you'll have to re-enter it.
It's been a long while since I used CC but I used to find that the default settings used to delete far too much anyway. I suspect checking them first would still be a wise move.
It's only the cookies I`m going to risk wiping at the moment. It seems a bit odd though. I downloaded the Opera browser because the ads are so intrusive on some of the newspaper sites but they still came through on Opera so I uninstalled it again. It was literaly only on the computer for 10 minutes but ccleaner says that there are 239 trackers from Opera.
Thanks for the replies. Thanks youngmafbog - I used the analyze function and the two options came up - trackers and junk. The junk was mainly temporary files but I`m not sure if that will wipe passwords so I deticked all of that and just wiped the tracking cookies.