Wring out the dish cloth after use.
Create a mixture of half water and half white vinegar. Dip the wash cloth into the mixture. Wring it out again.
Hang the dish cloth up to dry in a fashion where the inside material receives plenty of ventilation.
Replace the dish cloth every day.
Wring out the dish cloth after use.
Place the dish cloth in the microwave on high for one minute.
Open the microwave door and look to see if there is steam coming from it. If not, microwave another 20 seconds. When the dish cloth is hot enough to create steam, then it is hot enough to kill most bacteria. You can do this with you sponges as well.
Allow the dish towel to cool before removing from the microwave.