I posted a question a few months ago and we are just now getting into our home to clean up and finish the log walls on the interior. I reseached the chemical products for "bleaching" and cleaning the walls before sealing.Based on some replys I got and research We decided to go with just sanding to avoid possible damage to wood if not rinsed well enough. We today put the first coat of water based poly on and were very disappointed that the walls looked very blotchy. Not from the poly,but the sanding job we did. We used 60 grit discs to get the most yellow/dirt off. It looked like we had done a good job, but like I said, it was horrible. Before we go on to do the other rooms, does anyone have a cleaning agent the have used that is safe for the wood, but would lighten the wood and stains before we start sanding? We can't hose the upstairs walls to rinse since the second floor flooring is on, but I supose we could do the great room and downstairs that way if it was the best option. We have sanded the walls thoroughly again and will apply another coat of poly with hopefully a better result for the rooms we have already done. Any info would be great! We are going for a more natural/light look to the logs so did not apply a stain which may have helped hide some blotches! Help please! Thank you!