Oust Dishwasher & Washing Machine Descaler is specially formulated to safely and effectively restore appliances to their best. Oust descales and deep-cleans in one, removing the limescale, food and detergent deposits, leaving them fresh and clean. With regular cleaning, major appliances such as dishwashers & washing machines can work more efficiently to reduce energy bills.Directions: Dishwashers -( suitable for all dishwashers)empty the dishwasher and pour the contents of 1 sachet onto the bottom of the machine.Run a normal program without a pre-wash.Washing machine- (suitable for front loading automatic machines only)-Empty the washing machine and add the contents of 1 sachet to the drum. Select and run a 60 degrees cycle without pre-wash.