How often should I run the Tub Clean cycle?

Run the Tub Clean (Download Cycle: P1) cycle once a month or after every 30 cycles to eliminate residual soil, odor, white spots and other dirt inside the appliance. Add 3 tablespoons (40 g) of citric acid to the detergent dispenser, do not use dishwasher detergent, and run the cycle without any dishes in the machine.