I used to install it for my brother. But it is better to ask real masters. I just poured the product from a drugstore vial into any container with a sprayer. Everything, we are ready to clean an auto air conditioner with chlorhexidine. Only do not forget to adjust a sprayer on the most negligible dispersion. We take off a cabin filter, remove a filter, start the engine, including heating, air recirculation, and accurately spray in the air intake channel. After cleaning the air conditioner with chlorhexidine with your own hands, ventilate the cabin for five minutes. Install the air filter in place.