The hot water with detergent is responsible for the cleanliness of your dishes, not the pre-rinse.
If you get into this habit, you are limiting the potential of the dishwasher, but you are also wasting a valuable resource: water. Simply scrape the dishes without rinsing them and then put them in the dishwasher to rinse.
To remove dirt from dishes, you can also remove food residues with a spoon or paper towel instead of rinsing them first.
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This smart move prevents food from clogging up the appliance. Some high-performance models are equipped to remove even the most stubborn dirt.