Using the K&N HVAC Filter Cleaner is a breeze. First, remove the K&N HVAC Filter from its place. Then, hold the 32-ounce pump spray bottle about 6 - 8 inches away from the filter surface and spray the cleaner evenly. Let it sit for a few minutes to allow the cleaner to break down the particles. After that, rinse the filter thoroughly with water. Make sure the water runs clear. When cleaning, don't use hot water as it might damage the filter. Also, avoid using any other cleaning agents along with this cleaner. For maintenance, clean the filter regularly according to the manufacturer's instructions. This will keep your HVAC system working efficiently and extend the filter's lifespan.