I'm sorry to hear you're having this issue. There are several factors that can effect the dishwasher's ability to clean the dishes effectively. Please follow the link below to the Troubleshooting Guide, then select "Operation" > "My Dishes Still Have Food Particles On Them/Dishes Are Dirty": http://support-us.samsung.com/cyber...
Besides trying different cycles or loading the dishwasher differently, this article will walk you through several other tips, including making sure your supplied water is hot enough and checking the nozzles for clogs and proper functioning. If the Guide does not resolve the issue for you, please use the Live Chat option on your product's support page or call 800-SAMSUNG to speak to an agent who can assist you further.