How do I keep white washcloths white?

by Beverly

How can I keep white wash cloths looking white? Bleach, blue whitening, etc. does nothing for the light brown color my washcloths turn after several washings. I upgraded the quality of washcloths, but after a few washings, still the same brown center on the washcloth. I don't have this problem with white bed linens so I don't think it is my detergent. I use oatmeal bath wash. Could that be the problem or what else could be the culprit??? Yes, I have hard water.

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