How do I remove Distributions

Hi,
How can I remove old app distributions without them getting re-distributed
all over again?
(Zen 6.5 SP1 / NW6.6 SP3)
Removing the directories from the Distribution Server and the Subscriber is
pointless as they just get distributed on the subscriber again. Obviously
they are already stored in the directories in the PDS\TED\SUB system and
that is where I should remove them from on each subscriber too I guess?
But how do I relate which (numbered) sub directory is which app?

Can I delete the whole PDS\TED\SUB structure on a subscriber. Will it cause
a hiccup or will it just distribute everything from scartch again which is
idealy what I want as the Distributor has had a good cleanup of a few GB but
they still keep coming back on the subscribers.

Thanks - Mark