How to deal with stuck EOIO messages in the Adapter Framework

regarding the process as explained by Stefan Grube blog on [How to deal with stuck EOIO messages in the Adapter Framework|http://www.sdn.sap.com/irj/scn/weblogs?blog=/pub/wlg/3566] [original link is broken];

I have Asynchronous messages (with Qas EOIO ) that are stuck (in holding status ) on the receiver channel. I have messages dating back that I do not want and I want to DELETE them rather than reprocess them. I have tried CANCEL and CANCEL on the very last message (as EOIO) but they remain and I have thousand of these messages (they date back a few years!) so is there a quick way to purge the entire queue?