Inventive subject matter disclosed herein includes a method for treating a chronic wound, and methods for treating bacterial infections. The method for treating a chronic wound includes mechanically debriding a chronic wound, and applying a formulation to the wound for 5 to 60 seconds, the formulation including: phenolsulfonic acid&mdash；37% by weight； guaiacolsulfonic acid&mdash；24% by weight； free sulfuric acid&mdash；29% by weight； and water&mdash；10% by weight.
