Which Cleans Better? Liquid vs. Powder Detergent - Bob Vila- laundry soap powder Powder washing detergent powder powder washing ,Powder 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 ...Washing powder or liquid detergent: Which is best to use?Aug 04, 2020·Washing with a powder detergent. Washing powder is usually cheaper than liquid detergent. It makes your laundry smell nice, and it is more durable than liquid.