How to use detergent in your Samsung washing machine- sunlight washing powder fluorescent powder fingerprint washing soap ,Powder can be a little cheaper, but harder to dissolve in cold water. Liquid can be used to pretreat stains, but it's easy to accidentally use too much. Whichever you choose, you need to include the liquid detergent insert in the detergent drawer when using liquid detergent, and remove it when using powdered detergent.