A recent tag sale discovered a long handled brush that I knew the Poke vent tubes would like. This brush, found out to be a "dryer vent brush" is about 28" long with brush and wood handle on each end and can be bent and handle twisted in all sorts of ways to get into the inside edges of the vent tubes that run up the inside back of the stove. It can also be used to knock off ash from inside the exhaust pipe by access from the removed damper. Works pretty well and really quickens up the cleaning process every 5-6 weeks. Harbor Freight, Home Depot and hardware store sell 'em for ~ 3-7 bucks. I'm sure this can be used for the Pioneer models as well.