Buying a pint in a pub in Blackrock yesterday and the female barman coughed all over it while it was resting.....
Not absolutely immediately but pretty quickly - they won't be hanging around for weeks/months, never mind centuries like plastic bottles. As anyone who has ever left a paper hankie in the pocket of black clothing in a washing machine load will attest...just like plastic bottles and plastic nappies, paper hankies are designed not to break down on contact with liquids.
It takes about a month. Orange peel takes 2 months.Not absolutely immediately but pretty quickly