Lots of different things have been tried from what we\'ve seen in threads - sponges (and \'sponges\', i.e. foam), kitchen paper and even blotting paper. Basically anything that\'ll hold on to some water will work, but if you don\'t want to have to try to disinfect whatever it is (when it goes stinky or mouldy, not if) it\'s a good idea to use something disposable.
Einion