ozy365
ArboristSite Operative
Stihl makes a carbide tip chain for dirty wood and roots. You can't sharpen it with out a special grinder. I will clean a track in my dirty wood with an ax or hatchet before putting my saw to it. If you know your saw, stand to the side and work mostly as a plung cut. Maximize length and winch over branch rollers onto the trailer with a good come along. I cet a lot of dirty logs form local saw mill trash piles to put through my out door boiler. Good luck.