The BEST thing I have found is the StarBrite non-skid deck cleaner and a stiff deck brush!!!! I pick it up @ Academy. Little bit goes a long way & you do have to scrub it some, but it picks up the ground in dirt & does not leave a slippery deck behind. I use it about once a month. I do use a magic erasure on any black marks that I see (especially on the non -textured parts of the boat). BTW, my pathfinder has a completely white deck with a non slip texture & it shows every bit of dirt!
For dried blood, I have tried comet/ soft scrub with bleach, and even tried hydrogen peroxide. All three work, some better than others depending on my luck that particular day.
