Here's the first tip:
1. Before you run your dishwasher to clean your dishes, run hot water down the drain and turn on the disposal for 1 minute. This clears out the dishwasher lines. This has helped tremendously.
2. This next tip I do quarterly or when I think the dishwasher is just not cleaning well. Pour ½ cup vinegar into the reservoir and run an empty cycle. This will disinfect your dishwasher.