This is an over the counter product – it does not require prescription. Directions: Remove cap from the small, graduated part of the bottle. Squeeze large part of bottle, with cap on, forcing KOE into the measurement chamber. Add 1/4 oz. to one gallon of cleaning solution or rinse water, use normally. Same dilution in water may applied to specific areas with plastic lawn/garden type pump-up sprayer. For high pressure wash add to detergent tank at the ratio of 1/2 oz. to 6 gal. (1 to 1536). Ratios may be varied to suit the needs of the situation. Always use the least amount possible to achieve desired results. Effectiveness decreases when used with chlorine bleach.