The Detergent is an item found in Silent Hill 3. Heather Mason finds the bottle on the sink in Helen's Bakery on the second floor in the Otherworld version of Central Square Shopping Center. Its purpose in the game is, when combined with the bleach, to create a toxic vapor and clear the 2F hallway of moths. The vapor acts as an insecticide and allows Heather safe passage through the hallway.
The detergent will not appear if the puzzle difficulty is set to easy. Moths do not block Heather's path so the detergent is unnecessary.
- The item labeled as detergent may be a mistake as in the real world, detergent can be safely added with bleach. The combination of bleach and ammonia is what creates toxic vapors.