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The effectiveness of household cleaning agents for killing bacteriaFeatured science projectScience project video

Conclusion

Our hypothesis that Dettol was the most effective disinfectant, was proven to be false. Clorox was the most effective disinfectant, followed by Dettol, and then the dish-washing soap.

There is rising concern that frequent use of antibiotics is causing bacteria to mutate and become more resistant. The same concern is being raised regarding overuse of antibacterial soaps and similar cleaning agents.

Also consider

Try to repeat the science fair project using other cleaning detergents like antibacterial soap, Listerine or Bleach.

References

How effective are alternative household cleaners? - http://www.uwex.edu/news/2001/3/how-effective-are-alternative-household-cleaners

Bacteria and household cleaners - http://www.articlegarden.com/article.php?id=24882&act=print

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Complexity level:
7
Project cost ($):
30
Time required:
1 day to prepare, 5 days for science fair project
Material availability:
Easily found
Safety concerns:

The bacteria should be destroyed before being disposed of. Pour some bleach into the petri dish to kill all the bacteria before disposing of the dishes in the trash.