Liquid Laundry Detergent.
You need: Hot water, 1 bar Sunlight Soap (grated), 1 cup washing soda. In a large saucepan add grated soap and enough hot water to cover. Heat over medium-low heat and stir until soap is melted. Fill a large bucket with 9.5L of hot water, add hot soap mixture. Stir until well mixed. Then add the washing soda, again stirring until well mixed. Set aside to cool. Use 1/2 cup per full load, stirring well before each use (will gel).