I have wood siding on my house. They are basically 2X8 boards planed down to look like half logs and I think they are untreated. The Sikkens 1-2-3 product that is on it now has failed. I had the old finish sandblasted from the siding recently. I washed it with a bleach/TSP solution. While it wss wet, the wood had dark brown coloration on the grains and other areas. I have a feeling when I apply the new stain (Log and Siding) these marks are going to come back. Is there an inexpensive way t