What to clean siding with before stain?
Just started installing rough sawn pine on my barn project, and some of the boards have stained grey in spots from water sitting on the boards, and others look like they have other stains. Is there anything I can spray on the boards to restore them? I want to spray some clear stain or sealant on the boards to keep them looking decent but would rather have them looking as good as I can before spraying them. Thanks,