Cleaning and Stain Removal - How to clean log walls?

We have a log home, and after power washing revealed leaks in some of the joints, we now have dirty streaks on the interior walls. Also I don't know that anyone has ever actually "cleaned" the walls aside from vacuuming off the dust and cobwebs.

I believe the walls are treated with a light coat of polyurethane since they are slightly shiny and any sanding I have done takes off this finish. However they are still rough and slightly porous, so I want to be careful.

Any suggestions of a good cleaner and method to clean the walls?

thanks again fellow DIYers!

A good all purpose cleaner might remove the streaks. If wood is stained, the work will be more challenging and may require sanding down to bare wood and refinishing.

Thankfully it's not stained, at least not to where it's apparent!

Looking around the room I realize that we have a false wall in the kitchen which is not finished very well. I will need to clean that wood before applying some tinted poly. Any suggestions for a good pre-poly cleaner?

Are these bare logs? Do they have a sealer on them? If bare wood, using water-based cleaners will likely discolor them. If bare, I'd go with a dry sponge, which is a special sponge used dry and works like a giant eraser. If sealed, any all-purpose cleaner/degreaser would work.