You don't need to rinse the plates before popping those into a dishwasher.
And dishwashers don't use more water than a regular wash.
https://www.today.com/home/should-you-rinse-your-dishes-you-put-them-dishwasher-t129325
And dishwashers don't use more water than a regular wash.
https://www.today.com/home/should-you-rinse-your-dishes-you-put-them-dishwasher-t129325