Question

1 People's daily lives are full of cleaning products that range from simple soap to oven cleaners. Using soap or detergent can get things clean with very little effort. How do these cleaners get rid of dirt?
2 The soap that is used to wash hands, whether in liquid or bar form, is just one member of a large family of cleaners that includes detergents, or human-made cleaners. Detergents range from laundry detergent to shampoos, shaving foam, cleaning wipes, and stain removers. Soaps are a member of the detergent family, but unlike detergents, soaps can be natural. Also unlike detergents, they often leave a scum or film when used in water that contains certain minerals.
3 Long ago, soap was the product that did it all. It washed the body, it cleaned clothes, and it generally attacked all dirt, grease, and grime problems. People made soap by hand into bars from natural ingredients such as animal fat and wood ash. Today, however, some soaps, as well as most detergents, contain chemicals called surfactants. They work against a property of water called surface tension, which causes molecules of water to draw together on the surface of something. Surfactants cause water molecules to spread out instead. This helps water soak into things, such as the fibers in an article of clothing.4 Surfactants also have another key property for cleaning. Each surfactant molecule has two ends. One end is "water loving" and tends to attach itself to water. The other end is "water hating." It tends to attach itself to other substances, including dirt and grease. The water-hating end of the molecule is significant because water is not naturally attracted to dirt. But water that has been mixed with a surfactant goes to work on dirt and grease. As the machine turns or circulates the water, the surfactant attaches to the dirt and grease and pulls it out. Then, when the rinse water pours into the dishwasher or clothes washer, the other end of the surfactant molecule, the water-loving part, attaches itself to the rinse water. This pulls the dirt and grease away from the dishes or clothes and into the rinse water, which eventually drains and leaves behind the clean items. Select three categories to which different kinds of soap can belong. surfactants
natural products
detergents
scum or film
water-hating
cleaners

Answer 1

natural products
detergents
cleaners