Abstract: The invention relates to the use of an active ingredient for inhibiting dust mite feces and/or mold spores as well as for denaturing the keratin of animal hair as well as plant pollen or plant spores, consisting of an enzyme such as auxillase, alcalase, bromelain, alpha-chymotrypsin, collagenase, pepsin, pronase, thrombin and trypsin, especially the enzyme auxillase, preferably consisting also of water, anionic surfactants, fragrances and preservatives, packaged in containers used for spraying or squirting, or placed into textiles, textile materials or bags, in liquid or paste or gel form.