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It takes a few weeks to get rid of roaches in the kitchen for a small infestation, as the cockroaches will need to take the bait back to their nest to infect the others. For larger infestation, you may need to schedule multiple professional treatments, which could take several weeks or up to 6 months to get rid of the roaches fully.

Stink bugs don't harm humans or their homes, but they can do a number on vegetable crops, especially in large numbers. According to the Journal of Integrated Pest Management, the brown marmorated stink bug, recognized as a globally invasive species, has cost millions in crop damage and is a nuisance to homeowners.

Professional treatments can be immediate but may require follow-up for complete effectiveness, lasting several weeks.

Using chemicals with harsh odors is a natural way to repel bears. While the animal’s strong sense of smell is an asset in the animal kingdom, it’s a weakness here. Simply place bleach or ammonia in a bucket and leave it outside day or night. Ironically, bears also dislike the smell of pine, so you can use pine oil or a pine-based cleaning agent. Avoid using cleaning products with fruit or citrus smells, however.