The Sponge In Your Kitchen Is Gross!
The sponge is porous and there is a constant food supply for the bacteria to grow. The moisture of the sponge keeps the bacteria alive and growing. ICK!!!
How Often Should You Replace The Sponge In Your Kitchen?
Replace it weekly. They are cheap! In between replacements, throw it in the microwave in a bowl with equal parts water and white distilled vinegar for 5 minutes or toss it in the dishwasher daily with the dishes.
Regular hot tap water does not get hot enough to disinfect.