If it was me I would take a spray stream bottle of pure clorox bleach and spray some stream down the vents. Fumes might kill it or if it comes out hit it with the bleach.
That’s funny right there. The pic of the web and spider was on the steering wheel where the air bag is. Spraying watery stuff on that might get weird results. Maybe you could just gently drive into a fireplug and set the bag off. That should show Mr Spider?