Tough Stuff (16oz Version of the "Strong" product) Tough Stuff & Strong is made from organic, ecocert and ToxicFree ingredients, and is completely biodegradable and safe to use with septic systems. Can replace over 10 products in your garage, those used for the home exterior, as well as those used for tough jobs and stain removal inside the home. Effective against bacteria, mold and mildew.