How To Clean Dish Sponge. Simply place a completely wet sponge in the microwave for one to two minutes, keeping an eye on it while the microwave’s on. A third way to sanitize your sponges:

“methods that provide heat—microwaving, or placing sponges in a dishwasher cycle that has a heated. How to clean a sponge with vinegar. You can also microwave a damp sponge for about a minute.