drlynes,
Quote:
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Homeowners have tried scrubbing with detergent to no avail,
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Are you sure it is mud? If a detergent with water and scrubbing does not remove it, must be something else aside from dirt, like dirt from the ground.
Either that or you have some amazing mud in Texas!
Another thought comes to mind. Is it possible that this "mud" was sealed over by the Thompson's "stain"? If so, its a strip and recoat.