Last year I stained my large deck with a semi solid stain from Sherwin Williams. I got a very light gray, and it looks almost white. Well, my irrationally decision making self didn't take into account the lovely red of Georgia clay. This makes my deck look dingy and no amount a cleaner is helping. I'm resealing the parts of my deck that were not finished last season and I'm wondering if there's some kind of sealer I can put over this stain to help prevent future stains?