Delete my iTunes info from friend's computer?

[choirboy]

I recently got a new credit card, which means of course my old one expired. I once used a friend's Mac with my iTunes account, and that friend (who lives in another city) said he is now getting "iCloud pop-ups" saying my card info has expired.

We of course would like to get rid of this reminder. He says there are no cookies in his browser settings labelled "apple" or "iTunes" or "icloud", so any advice would be appreciated.

Thanks,
Mark

 

[Weaselboy]

Has he tried going to iTunes then to the iTunes store then click the account at the top left then click sign out at the login window.