This product is recommended to be used at 5 oz. per 100 lbs. of dry fabric. More or less may be required depending on soil and stain.
For soaking of laundry exposed to heavy or set stains, dissolve 2 tbsp. for each gallon of warm water in sink or pail, add laundry and let soak for ½ to 2 hours, then wash normally. When washing colored fabrics make sure to test dye for color fastness.