Are you using HE High Efficiency detergent?
Use of non-HE detergent can cause a film residue. Use only HE detergent.
Always measure detergent and follow manufacture’s directions based on load size and soil level.
Detergent works by attaching to dirt and oily particles and carrying them away. If there is not enough detergent for the soil level in the load or the water hardness, then soils can redeposit onto the load. Use more detergent for washing heavy soils in cold or hard water, following detergent manufacturer's recommendations.
Older laundry detergents do not dissolve well in the washer, especially powdered detergent. Keep detergent containers closed to extend the shelf life. If you notice that your detergent is not always dissolving, replace with new detergent. Always use only HE High Efficiency detergent in your High Efficiency machine.
Using non-HE detergent can cause oversudsing, and cause longer cycle times, as the washer tries to eliminate the oversuds situation.
CLICK HERE to watch a video on How High Efficiency (HE) Washers Work.