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Mix 4 ounces, or 1/2 cup, of dish washing or laundry detergent to 2 gallons of warm water in a bucket. Set your ladder in a stable position where you can reach one end of your soffit easily. Soak a large sponge in the warm water solution and scrub it over the fascia and soffit working back toward the house. Click to see full answer. Correspondingly, is it OK to pressure wash soffits and fascia?