A welcome mat left a brownish stain on my concrete front porch, right in from of the door. I have tried bleach, deck cleaner and Amway cement cleaner. Nothing worked. Is there anything else to use without having to paint or stain the porch? My husband is against any paint or stain on concrete as he says it will have to be redone constantly to look nice.
HELP!!!!!!!!!!!!!!!!!!!!!!11
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