Why you should always use liquid detergent - CNET- powder laundry washing powder powder detergent laundry powder ,Powder can also leave chunks of undissolved detergent in your washing machine parts. As you can imagine, this can lead to malfunctions. It particularly affects the washer's drainage system.Why you should always use liquid detergent - CNETPowder can also leave chunks of undissolved detergent in your washing machine parts. As you can imagine, this can lead to malfunctions. It particularly affects the washer's drainage system.