Generally the first step in any mold remediation job is to first clean the surfaces that have mold growth on them. There are several mold cleaning products that can get this done. Some of the most popular ones are peroxide based. Generally due to shipping restrictions, there is only a certain percentage of concentration that these peroxide cleaners can have. Several manufacturers such as Fiberlock and Concrobrium Pro, have recognized this, and have began providing stronger products by the use of Boosters, such as Fiberlocks Hydro-Boost Additive, and Concrobrium Pro's 2 Part Mold Stain Remover. As always, please use caution with the use of any chemical.