Putting a wet towel in my washer will void the warranty so I don't do that.
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I use Tiny Bubbles and have been very happy.Â
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We use some creams and I have stripped our diapers a couple of times in the past several months as a precaution. I have just done extra washes on hot with cold rinses. My inserts and natural fibers I will put on sanitize and have used bleach before (back when I used Charlies I needed to bleach and/or sun more frequently). Now I have some biokleen oxygen bleach that I use every few washes since I can't sun my diapers in the winter.  DD just got her first real rash I am stripping the diapers in case there is bacteria or build up from creams. After washing them with my regular cycle without spinning (so I will have extra water for the next wash) and I am bleaching the inserts, prefolds, and fitteds with hot water and running an additional cold wash to fully rinse. I am wary of using bleach on my pockets/PUL so I am going to strip with the oxygen bleach and detergent using hot water, cold rinse and an additional cold wash to rinse.
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For clean diapers you could just use extra hot water and detergent and probably get them stripped since it sounds like they are all natural fibers. The oxygen bleach would be the next step if the detergent she had used them with is known for build up issues or rashes, or if there is a lot of staining.