The floor of my screened in porch is douglas fir. I washed it with a mildew stain remover, but now there are areas that are all bleached out and the pigment is gone. How can I restore the pigment so that the floor color is consistent? Also, I'm thinking of finishing with a satin spar varnish, to provide a harder finish that is less impervious to mildew. What do you recommend?