Fill a sink halfway with warm water. Add a tablespoon of liquid dish soap, Swirl the water around to create suds. Place your silicone baking pads in the water to soak for at least one hour to loosen baked-on food or grease. Use a sponge to remove loosened debris.
Remove the silicone pads from the sink and load the dishwasher as normal. Be sure to have tall items, such as dinner plates or skillets, on the bottom rack of the dishwasher.
Place the silicone baking pads on their sides between the spaces of the other items you are washing. Lean a pad against the item in front of it to help it stay upright, if necessary.
Run the dishwasher using dishwasher detergent as you normally would.