Sponges are the dirtiest items in our homes and sponges grow odor-causing bacteria rapidly! By the time your sponge is smelly, it is loaded with odor-causing bacteria! And sponge holders are dirty too! So, unless you throw out your sponge after every single use, or clean it AND the sponge holder (or wherever you store your sponge) after every single use, you are cleaning with a dirty sponge and spreading odor-causing bacteria as you use your sponge.
Why throw out a perfectly good sponge just because it smells? Sponges soak in our powerful, patent-pending cleaning solution while they are being stored, so sponges are continuously cleaned while not being used, giving you a fresh clean sponge every time.