Using too little detergent. Detergent contains ingredients which help to improve drying. Increase the amount of detergent used as directed on page 16. Be sure dishwasher is being loaded properly. Refer to the User's Guide.
Some items are difficult to dry in a dishwasher even under the best of circumstances.
Cups and glasses with concave bottoms will hold water at the end of the cycle. Plastic and Teflon have a porous surface that holds droplets of water and is difficult to dry. Towel drying of these items may be necessary. Occasionally, a few items may have unremoved food soil left on them at the end of the cycle. Water temperature is too low.