To dry tennis shoes after washing or to dry out any wet shoes, put them in front of the refrigerator vent grill. Open the laces wide, pull open the tongue of the shoe so the air can get inside and lay shoes on their side with the opening facing the grill. Hold you hand over the grill while the refrigerator is running and you will feel air blowing out one side more than the other, so use this side for faster drying. This is room temperature air so it won't shrink the shoes like a dryer. By morning, they will be dry.