I was brushing the smoke chamber way too hard and a 30 year sweep in Reno called me out on it
I used to go at the smoke chamber like I was scrubbing a grill, all that force on a stiff poly brush, thinking more pressure meant cleaner walls. Then about 8 months ago a guy named Dale who has been in the trade since the 80s watched me work a chamber in Reno and just asked me why I was trying to take the mortar off. I looked up and there was grit everywhere and I had actually knocked a chunk loose near the damper frame that I then had to fix before I could leave. He showed me his own brush and how he lets the head do the work with slow passes and light pressure, and the walls came out smoother with way less mess. So now I am curious, do any of you use a softer brush on older chambers or do you just keep one brush for everything?