What happens if you use soap in a dishwasher?
Using dish soap in a dishwasher creates a thick, sudsy foam in the appliance that can overflow through the dishwasher door. This is due to the formula of dish soap that relies on suds and bubbles to clean dishes.
On the other hand, dishwasher detergent relies mostly on enzymes to get your dishes clean. Liquid dishwasher soap or detergent pods dissolve in water, and as the water moves throughout your dishwasher the enzymes work to break down proteins and starches until they can be completely dislodged with water.