An improved material and process for decontaminating an organic chemical spill and animal waste is made by: partially composting plant material; adding spent mushroom compost; mixing some of the partially composted plant material with the dry plant material; inoculating the mixture with a small amount a petroleum hydrocarbon; adding iron sulfate, ammonium nitrate, or a mixture of iron sulfate and ammonium nitrate; adding water; and adding a clump preventing material. A nutrient may also be added to this mixture. The final product is mixed with the spilled organic chemical and allowed to incubate for a suitable time at ambient temperature. A similar material may be used as a pet litter.