If you own a top-loading washer, or live in a building that has older machines, you may be using soap flakes or powdered detergent instead of liquid laundry detergent. However, if you want to wash your clothes in a more energy-saving manner by keeping the water temperature on cold, you'll benefit from trying these tips with your non-liquid detergent.
First, try adding the powder to the bottom of the washing machine and letting a little water run before you add any clothes. This will help to ensure that the detergent will dissolve and not get stuck in folds of your clothes, which can damage the garment and guarantee another round of washing.
If this doesn't do the trick, try dissolving the powdered detergent in a pitcher of hot water before adding it to the machine. Problem solved!