Liquid or Powder Washing Machine Laundry Detergent? You ...- laundry soap fluorescent powder detergent washing powder Machine wash detergent ,On the down side of using powder detergents, they can contain more chemicals than liquids and the sodium sulfate in most detergents can cause problems in septic tanks. Liquid detergents are already pre-dissolved and start washing as soon as it comes in contact with agitated water. You can also get rid of stains better with liquid detergents ...Which Cleans Better? Liquid vs. Powder Detergent - Bob VilaPowder detergent is slightly cheaper. Powder detergent will run you $0.10 to $0.24 per laundry load. The lack of liquid and the lightweight cardboard boxes used for packaging keep the product ...