ELI5: How does soap clean things?

Imagine you're eating a greasy pizza! Your hands get all oily and gross. Water alone doesn't wash it off, right? It just beads up and slides away! That's because oil and water don't like each other.

Soap is like a special agent that can talk to both oil and water. It has two ends:

• One end is a water-loving (hydrophilic) part.
• The other end is an oil-loving (hydrophobic) part.

1. When you use soap and water, the oil-loving end of the soap sticks to the grease and dirt on your hands (or dishes, or clothes). Think of it like the soap molecules hugging the grease.
2. The water-loving end of the soap sticks to the water. Now the soap is acting like a bridge between the grease and the water.
3. When you rub your hands together (or use a sponge), you help the soap molecules lift the grease and dirt away from your hands.
4. The grease, dirt, and soap all clump together into tiny little balls called micelles.
5. When you rinse with water, the micelles are washed away, carrying the grease and dirt with them. Bye-bye, yucky stuff!