Selling commodities is difficult because people buy on emotion, or instinct if you will. Want and desire are powerful emotions that can stimulate the release of endorphins. It's why some people are shop-a-holics. It feels good to buy. But it's not that easy to get emotionally worked up about borax, chlorine, and salt. As an economic good, a commodity has no real differentiation, so small price differences in competing products can make huge differences in total sales.
Think about how you won't buy gasoline at one gas station because it's four cents cheaper around the corner. That's a commodity. Ever buy a piece of art that way? Of course not because art's value is in the eye of the beholder, is easily differentiated, and consequently will have wide price ranges. When art is sold, it's sold on the artist's reputation or the emotion the piece evokes for someone. Marketers work overtime to take commodity-like goods and then pretend they aren't commodities by creating and building an emotional appeal around the brand.