The house I bought this past summer has a winslow ps40 pellet stove which has been running great. I would like to remove the cleanout Tee but having difficulty. I can turn it clock wise about an inch or so but can't get any other movement. I assume I should be pulling it strait down after turning it. It is a 12-15 year old dura-vent tee. Any thoughts on how to remove this particular clean out? I have only used gloves so far as I didn't want to damage with any tool (yet). I saw a video on how to remove the plug but it looked like a slightly different model from Simplson. ?