Juice, cross-platform podcast receiver

Apologies if this is a divvy newble question, but I have looked in the FAQs and documentation and can't work it out.

I want to download podcasts, listen to them, then delete them from my hard disk. But I don't seem to be able to get Juice to live with this. It often goes back and automatically downloads all the old podcasts which I had deleted.

What am I doing wrongly?