Heavy Duty is a brand of laundry detergent seen in the episode "Dumped."
Heavy Duty is a small red package of laundry detergent with an orange label and depicts illustrations of bubbles at the bottom. The product's name is written in cyan blue letters. Combining the detergent with water will create pink foam.
When Patrick asks for soap to wash his laundry with, SpongeBob asks whether he wants to use Fresh Scent or Heavy Duty, then proceeding to cry into both detergents after getting memories of Gary, who has decided to stay with Patrick, and him doing laundry together.