iCal server account constantly reappear (removal not possible)

Hi,

I'm trying to get rid of an old ical server account within my user. Standard is to remove it using the settings in iCal - however every time I start iCal again this account appears again.

I recall that there are some files I can delete - but this did not helped in the past. Can someone post this link again?

Are there any other suggestions how to remove this "wrong" account for ever?

Alex