How do we get rid of mold growing on block wall in a basement? It's at a rental property we own that was getting water in the basement when it rained. We think we fixed the water problem but now there is mold/mildew growing on the basement wall ...it's also on the carpet near where the water was. Who do we call to fix this or how do we fix this ourselves? We did buy a dehumidifier for that apartment ...will that help any?