the way the stove is positioned in my house the pipe on the roof is at the lowest point on the roof about 2 ft over my head when i stand on roof next to pipe., i always clean pipe from the bottom (stove end and UP) im just never sure if im getting all stuff out. all i ever get is about a cup of mostly ash and barley any creosote, but i burn good 1 to 3 yr seasond wood with good hot fires and some enviro logs now and then, i see no build up on top of pipe or anything, just trying to be sure i get everything, very hard to see up pipe due to 1 45 degree elbow. i clean 2 time a yr but thinking of going to once.