A kitchen sponge is one of the dirtiest item in most households.
The dirtiest household item is often a kitchen sponge, with more than 75%
of all sponges containing potential fecal bacteria, research has shown.
Kitchen sponges have been found to be more than 200,000 times dirtier than
toilet seats. The average kitchen sponge is thought to contain more than 10
million bacteria per square inch (6.45 square cm), which is typically the
result of its moisture levels and small crevices that allow germs to breed.
The risk of spreading germs with a kitchen sponge can be reduced by
microwaving it to kill bacteria.