Smell may be the most undervalued of all of the senses — but it shouldn't be.

A McCann Worldgroup study even found that some millennials rank their sense of smell below their phone and laptop in terms of importance. But we actually pay attention to smells a lot more than you may realize, especially when choosing items that go in our homes.

Consumer data shows that we buy A LOT of scented cleaning products. In a 2014 study, a polling company found that 40% of American consumers considered whether a dishwashing detergent had "a pleasant fragrance" when buying it.