Instructions
Answer the following questions about pressure washing an outdoor dirty wall. Write your answers in the spaces provided.
The Science of Cleaning
What is the main science concept that explains why pressure washing is effective at removing dirt from surfaces?
What happens to the dirt on the wall when high-pressure water hits it?
Why might some dirt or stains remain on the wall even after pressure washing?
How does pressure washing help prevent the growth of mold and mildew on outdoor walls?
Imagine you are inventing a new eco-friendly cleaner to use with a pressure washer. What ingredients would you use and why? Explain how it would work scientifically.