I'm hoping for some useful (i.e. not call a pro,clean it more often) suggestions from the contributors here. I have an Empyre Pro Series 400. There are a number of parallel ~1.5" stainless steel flues that run vertically ~42" at the rear of the unit. Cleaning these is difficult and obviously has not been done well enough or often enough, and that will have to change moving forward. At the moment, most of these flues are blocked with glazed creosote. I don't mean they have some build up. I mean, they are 100% blocked. Some are clear for most of their length, but blocked near the bottom (presumably where it has been out of reach of the cleaning attempts). Others are blocked, fully, for most of their length. How to clean these out is the question. My reading so far suggests that the chemical removers are unlikely to be useful. I've tried using a grinding bit on a long flexible shaft for a Dremel tool, which worked but would take days and even an hour was on the verge of burning out the tool. I've now sourced a flexible shaft extension for a 1/2" power drill and can pick one up 30 minutes away, and hopefully I can find some sort of boring bit that will work faster than a grinding bit. Suggestions for a bit, and any other methods or ideas would be greatly appreciated!