I would like to obtain more information for properly re-staining my redwood siding. One contractor has suggested washing the house with a deck cleaner or TSP first using a power washer set at a very low spray, then rinsing and then lightly sanding the rough boards.
I do have some boards that are turning black do these need washed with clorine and can you mix the clorine in with the deck cleaner/TSP? Then he s suggesting a product called Sikkens. I believe it is the "Sikkens SRD".