Fillers Used in Laundry Detergents | Hunker- washing powder laundry soap washing powders tide ,In addition to sodium sulfate, borax and water, there are smaller amounts of other fillers in many detergents, both liquid and powdered. These fillers can include chemicals, such as sodium silicate, to prevent corrosion inside your washing machine, and agents that limit the amount of foam produced by the detergent.Why doesn't washing powder dissolve in my washing machine?Jul 14, 2020·Collects Inside Laundry. Powder detergent can sometimes get trapped inside rolled pant legs, pockets, pillow cases or even in socks when you pour it into the washing machine after the laundry is already inside. If any amount of powder gets caught inside laundry items, it might not have access to the water to dissolve.