It's pretty clean, Lightning.you can see light up thru so you must have opened it up some
Fred, I clean out my pipes (and my chimney using the vac blow out method) pretty regularly.
I bet, around once a month.
Those pics of my pipes a number of pages back were after only a month (approximately) of burning.
Before today, I thought I was adequately doing the job.
This becomes problematic from a logistical standpoint.
It's often difficult to get on a roof during the winter due to snow.
Running a brush down the chimney 3 or 4 times a winter will be nearly impossible.
My son hates roofs.
If I still had shingles, I'd still go up even though I'm not as nimble as I once was.
Don't want to pay a sweep every month