You should be able to get the tip out by removing the back panel of the iPod and then pushing it out from inside using a pin or other thin metal device.
You could use this guide to get you there:
[guide|631]
Once inside, you'll have better access to the rear of the audio jack, which hopefully is like the others and has the strip of moisture sensing paper at the end, which you can remove to gain access to the hole at the inside end of the jack.
Good luck!