Somebody gave instructions on how to be selective the other day - I’ll see if I can find them.
Here they are 
I don’t know about other browsers but if you’re using Chrome and you only want to clear cookies for Folksy you go to Preferences → Advanced Settings → Under Privacy click ‘Content settings’ → Under Cookies click ‘all cookies and site data …’ then it takes you to a page where you need to type Folksy in the ‘search cookies’ box and then finally click ‘remove all shown’ (they should all have folksy in their names) and then ‘done’.
It’s a bit of a palava (or pavlova … mmmm pavlova) but at least you don’t lose cookie data for other sites. It sounds really annoying to have to login all the time so I hope it helps someone! smile**