OXO Good Grips Soap Dispensing Kitchen Brush
This is truly an effective and useful tool in the kitchen. I don't like using sponges because they harbor bacteria, but this soap-dispensing brush doesn't. You can replace the head or remove it to wash in the dishwasher. I fill my brush with soap about every other week, depending on the dish load. It's ergonomically correct, and works very well on challenging, cooked-on foods.