Big problem on new cedar deck.
I put red postes notes as markers on several boards in preparation to show contractor where there were problems with the decking boards. Before I had a chance to remove these pieces of paper, it rained. When I removed them there were red stained marks where the postes notes were. These would not wash off. I tried fine steel wool and water. This “worked” and I hosed everything off. The next morning to my horror there were blackened areas where I had steel wooled. To make matters worse, there are now areas with light black speckles – probably due to the hosing down of the deck that dispersed the steel wool particles. I have tried TSP without success. I am concerned that even if I get the stains out somehow for now, they will come back because of the steel wool particles lodged within the wood. I can replace all of the blackened boards at a small cost but I would still be left with the rest which are mostly speckled to one degree or another. (I know not to ever use steel wool again!!!)