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Yes, crawl spaces can attract bugs, especially since moisture tends to build up in the space, and moisture attracts pests. A good way to prevent pest infestation in your crawl space is to install a vapor barrier—called crawl space encapsulation—on the interior to seal the space, along with a French drain or some other kind of foundation drainage system outside to keep runoff out of your crawl space. You can also seal foundation cracks and repair damages to cut off access to pests.

Roach spray usually starts working almost immediately on contact—within seconds to a few minutes. However, if it's a residual spray designed to keep killing over time, it can take hours or even days to fully affect roaches that come into contact with treated surfaces. For larger infestations, it may take at least a week to see a noticeable drop in activity, since not all roaches are exposed at once.

Deers have an extraordinarily strong sense of smell, which means they can react strongly to certain scents. Lavender, garlic, mint, cinnamon, clove, and human hair are some of the most offensive scents for deer. You can try mixing some of these pungent oils or scents with a spray mixture and adding them to your garden.

Carpenter ants can go away on their own if their food source is eliminated, but this could take weeks or months. If you have an infestation on your hands, carpenter ants need to be treated by pesticides from a licensed professional in order to go away as soon as possible.