Beaverton neighborhoods near Fanno Creek, Summerlake, and lush greenbelts experience cool, lingering ground fog and heavy canopy shade. This traps moisture on siding and promotes rapid moss and algae growth. Before painting, we apply an eco-friendly mildewcide wash to kill spores down to the root, pressure-wash the surface clean, and finish with a premium exterior paint containing advanced mildew-resistant additives that keep growth from returning.