You will need:
Dish rags are handy for all kinds of kitchen work, but unfortunately their exposure to moisture, spills, food and dirt can create a strange stale odour. Cleaning them frequently will ensure that they are bacteria-free and safe to be used.
Cleaning the dish rags:
If you used the method with the boiling water, the stains are probably well dissolved and ready to be removed. Get a cleaning detergent, apply it on a clean sponge and brush off the stains. Make sure you are not using strong toxic detergents. They can be dangerous when you don't know how to use them.
Removing stains with natural products:
Removing stubborn stains: