Unfortunately, concrete is porous, unless you had a sealer on it you may have to live with the stains.
"When I was in Canada, I had a lot of time to think."- Doug Sahm
[B][COLOR=red]UDS x 5[/COLOR][/B]
[COLOR=blue][B][I]CSBBQA, KCBS, NOBS(Northern Ontario Barbecue Society)Professional Barbecue Team. USAJFKCENMA.[/I][/B][/COLOR]