Well bleach for the obvious reasons (toxicity, etc.) and vinegar.. hmm.. im not sure if it would kill all the bacteria? (The method's not mentioned in the book)
In Organic Housekeeping it says that dishwashing sponges doesn't clean them because the temperature inside isn't high enough. To clean them you must microwave on high power for 30-90 seconds based on your microwave's power and sponge...
I recently bought some new sponges made of recycled walnut shells (which I thought was pretty cool!) BUT i was also reading Organic housekeeping and they have a section in their about how unsanitary sponges are because of the amount of...