Try some powdered Laundry soap, sprinkle the soap on a spot and just use enough water to get it wet and let it set for a few minutes before you rinse it off. Use one that has a bleaching agent as an additive.
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Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming ...."WOW! What a ride!!!!!"
LUNCH with THEOLDMAN...On a break for now...