The liquid solution formulated on an aqueous basis with a surfactant mix to cooling down and catch pollutants from exhausts of diesel engines. The surfactant mix has a volumetric percentrages composition of: sodium dodecylbenzene sulfonate at 45% to 85%, preferably 60%; sodium alkyl sulfonate at 12% to 30%, preferably 20%; sulfonated derivatives of benzimidazole at 8% to 25 %, preferably 15%; ethanolamine from fatty acids at 2% to 7%, preferably 5%. The liquid solution may also contain potassium carbonate K2CO3 at 0.6% to 5.4%, preferably 3.8%; potassium permanganate KMnO4 at 0.7% to 3.6%, preferably 2.3%; potassium hydroxide KOH at 0.07% to 1.25%, preferably 0.25%. This liquid solution requires a specific catalytic bed.