In CCleaner at the options dialog, you can define which cookies to keep when you clean the cookies.
So I add 'forum.ccleaner.com' and then I have to add other forums that I frequently visit so I dont have to login again everytime I visit them.
I think it would be perfect to be able to use wildcards when you define what cookies to keep.
So that I can add for example 'forum.*' then it delete all cookies except cookies belonging to the subdomain of 'forum' of any domain.