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Some snake repellents are risky to use around people and pets because they use the active ingredient in mothballs, naphthalene. The United States Environmental Protection Agency (EPA) has classified naphthalene as a carcinogen that can cause damage to the liver, neurological issues, and cataracts. 

The Colorado State University Extension suggests there’s not enough conclusive evidence of the effectiveness of snake repellents to recommend their use.

If there is food sources and other places to build a nest, wasps may come back after their nest is gone. However, if you take measures to repel wasps, like planting pest-repellent plants or sealing cracks and gaps around the outside of your home, they aren’t likely to return. Be diligent at checking for new nests each spring to get rid of them as soon as possible and prevent bigger swarms of wasps in your yard.

If the nest is on or in your home, you should have an exterminator remove it. However, if the wasp nest is in an area of your yard that you don't frequent, you can leave it alone as long as the wasps don’t bother your household members. Wasps are very active during the summer months, but they will vacate in the fall and not return until the following year. So, if it's safe to do so, you can leave it, but if it poses a threat of being stung because it's in an area that you use frequently, consider having it removed.

Not usually. Most pest control will offer one-off services without the need to sign a contract. However, for especially large projects, or treatments that will involve additional trips for months into the future, pest control companies may require you to sign a contract.