How do I get rid of a horrible smell in my dishwasher?

Check down at the bottom of the door on both sides to look for moldy debris in the hinge areas. Also check beneath the lower washer arm. Lift it out, lift out the assembly so you can check for rotten food debris.

Hi, Dee!

I also have a Samsung dishwasher and after the wash cycle was completed and the dishes unloaded, I would leave the door cracked open to let the interior dry. I hope this helps!

need to clean the drain hose leading from it into either disposal or main drain/tap https://www.youtube.com/results?search_query=DIY+dishwasher+drain+hose+clean+out

https://www.mrappliance.com/blog/2018/september/how-to-clean-a-smelly-dishwasher/

https://www.wikihow.com/Clean-a-Smelly-Dishwasher

https://www.consumerreports.org/video/view/appliances/kitchen/5089246388001/5-easy-steps-to-clean-a-smelly-dishwasher/

https://www.youtube.com/watch?v=jEiKS8ezIQo

Did you clean the filter? I didn't know there was one and I had a bad smell. When you remove the filter (which is on the bottom in mine) you can clean it under running water. It solved my problem I hope it helps.