How to disinfect them and how long can I use them? It is very important to allocate rags and sponges for various household tasks, always taking into account not to combine them, thus you will avoid cross contamination. The maximum time of a sponge is 15 days and then discard it. For an effective disinfection we recommend heating 60 ° C of water and adding a teaspoon of Clarasol "El original", after that, let it dry in the sun and you will have obtained a complete disinfection.