Since you mentioned both air filters, I assume you must be refering to the cabin carbon filters. Remove them (easy clip-off tops) and use an air-hose to blow them clean. Then put them back into the compartments, leave the tops open, run the air/fan on high in the car. Spray a disinfectant, like Lysol can spray into the two air filters and let the disinfectant flow into the vents. Helps with mildew and stale smell in your ac vents.
When I do it, I drape a large bedsheet over my leather seats, just in case the Lysol mist that blows thru' your vents stains the leather. I don't know if they do, but just to be safe than sorry.