You’re done.

Nothing you can spray into a vent is anything you want to spray in a vent.

Not that it’s necessary or useful. Most spiders disperse fairly quickly anyway. There are species that share space, but there wouldn’t be thirty of them moving across your ceiling, they’d be holed up wherever they live and you wouldn’t see them.

For real, even the pesticide was a waste of time and money.

Don’t be wiping down your vents with stuff like that. That’s a horrible idea.