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!
You might try washing it with some hot hot water and TSP (Tri-Sodium-Phosphate) that you can get at any hardware or paint supply. Another option would be to corn cob blast, but it may not get it out if it is very deep into the wood fiber. Sounds like an insurance job to get the logs replaced to original appearance.