How can you make a hard sponge soft again?

To soften a hard sponge, you can soak it in warm water for about 10-15 minutes until it absorbs the moisture and becomes pliable. Alternatively, microwaving a damp sponge for about 1-2 minutes can help restore its softness, but be sure to let it cool before handling. If the sponge is too worn out, consider replacing it, as repeated hardening might compromise its ability to clean effectively.