Kitchen sink sponges this summer have been turning rancid. This is new to me. I buy the packets of ‘real-sponge’ from Trader Jo’s. They have always worked exceedingly well. However this summer not so, so I went to my local drug store and paid a lot more to buy ‘anti-mildew-sponges in a package of two. Purple in color, not the mild natural color, but if that will stop the mildew, so be it. Only it didn’t. Did not seem to matter what I did, the mildew problem continued. But then I bought a ‘pack of sponges wrapped in a white netting’ in Chinatown. Problem solved. Do not know what the difference is, and whether it is that the what-appears-to-be-netting lets the water wick away, but my sponges are now mildew free!