we had a chimney leak and we think its creosote (could be something else) that ran down our sealed interior log wall, we’ve tried everything and can’t get the dark run stains off the wall. sanding it makes it look worse b/c the logs are hand hewn and they won’t sand evenly with the uneven hewn texture. is there anything you can think of that would work. the logs were not stained a color just sealed with Sashco’s Symphony clear coat. thanks!