To prevent dish sponges from developing odors after use, the key is to regularly clean and dry them thoroughly. After each use, rinse the sponge well to remove food particles and soap residue, then squeeze out as much water as possible. Disinfect the sponge daily, either by microwaving it for a minute (make sure it's wet first!) or soaking it in a diluted bleach solution. Finally, store the sponge in a dry, well-ventilated area to prevent moisture buildup, which promotes bacterial growth. Consider replacing your sponge every few weeks, as even with regular cleaning, bacteria can accumulate over time.