If the dishes are still dirty or there’s a pool of water in the bottom of your dishwasher after the cycle completes, you likely have a drainage issue caused by a clog somewhere in the filter or plumbing.
Remove any excess water from the bottom of the dishwasher with a sponge or a few towels. Locate the filter, and remove it.
Run the garbage disposal for a few minutes while running the water to clear any residual food particles. Turn the garbage disposal off and let the water run for a couple more minutes.
Locate the air gap on the countertop near the sink. Slide the cover off of the air gap and clean out any food or debris that you see.
Make a thin slurry of hydrogen peroxide and baking soda. Pour the slurry down the kitchen sink drains and let it sit for 10 to 15 minutes, then flush with water for a few minutes.