Or just use your aging sponges in a rotating lifecycle. I have 4 stages/sponges at one time that slowly get demoted as they age.

1. New sponge only gets light jobs. Scrapped clean dishes, pans that just need the oil washed off.

2. Middle stage wear is used for stuck on foods and generally more gross dishes.

3. Not usable for dishes, but good for counter/stove tops.

4. Dirty jobs. Nothing food related. Floors, bathrooms, use with disinfectants.