So I'm so guilty of having a few of these laying around.
And then using it again and again 'til they reak! I don't even want to know what little micro colonies are being established on them.
I heard a good tip from a sweet old lady I wanna try. She said she replaced all of her hand towels and dish rags to white ones. Then she'll wash and bleach them in hot water so they stay nice and white and sanitized.
Then to use a new fresh one everyday. (So you will want to get a bunch of them. I think you can get a huge pack from Sam's Club or Costco).
Well I'm off to find my old retired dish rags and then off to the store to get new white ones.