Summary of my science fair project

The topic of my science fair project is called “The effectiveness of disinfectant”. Since many cleaning materials contain poisonous chemicals that are capable of causing damage to the nervous system, I researched the chemicals found in eight common lab cleaners. Also included in the research was the most effective way to use each of the eight cleaners. In order to determine which cleaner worked best, I tested a desktop and window for bacteria growth before being cleaned and after. By testing two different surfaces, I will be examining whether certain cleaners work better on different types of surfaces. Once the testing is complete, I will compare the average number of bacteria before the surfaces are cleaned with the number of bacteria after the surfaces are cleaned thoroughly with the various cleaners. Before I started using the disinfectants, I tested the desk for bacteria and find three large distinct growths. After cleaning the desk with eight different disinfectants, Ajax had only one small bacteria colony on it, while both ethanol and 409 had two large bacteria colonies on it. The window began with one medium-sized growth. It was surprising to learn that the ethanol and hydrogen peroxide plates had more bacteria than the window originally started with. My hypothesis assumed hydrogen peroxide would be the best disinfectant. However, after performing all of my tests and taking the average number of bacteria found, I discovered that Ajax is overall the best cleaner and Lysol comes in a close second.