Remove all information ical, how do it do that?

I have the following problem.
We have 4 macs with Tiger and iCal that all synchornize with .mac so we can inform ourselves. It al worked well, but now mu main computer does not synchronize anymore with .mac. I tried to de-register en register again with .mac but this does not work.
I have this problem since i have 10.4.5 So i think this is the problem?
But what i want to try is to delete everything what is in ical but how do i do that?
I have deleted
~/Bibliotheek/Application Support/ical/Sources/
~/Bibliotheek/Caches/com.apple.ical/
~/Bibliotheek/Caches/Metadata/ical
~/Bibliotheek/Preferences/com.apple.ical.AlarmScheduler.plist
~/Bibliotheek/Preferences/com.apple.ical.AlarmScheduler.plist
~/Bibliotheek/Preferences/com.apple.ical.helper.plist
~/Bibliotheek/Preferences/com.apple.ical.plist
But when I start iCal again: al information which i have is there.....
Seems sort of cache file that stores this data?
Can anyone help me with this?

same problem on my mac? removed the same files.
after I removed all the files and folders in application_support/ical, I can still see my old calendars for about 10 seconds, then they disappear. I then delete within this 10 second timeframe all my calendars. and then they really are gone. So like this, I could succesfully delete my calendars.
maybe that helps in your case.
BUT: that behaviour remains in my case: every time I relaunch iCal, after 10 seconds even the newly imported calendars disappear. they only show up in the first 10 seconds after launch of iCal. If I restart, same thing happens.
Who can help to do a clean reset of iCal?

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