A number of common food preparation surfaces were contaminated with E. coli bacteria, tested for density of bacteria population, wiped clean with dish soap, rinsed and re-tested to determine how much bacteria was removed. Granite scored tops after initial testing, and was only barely outperformed by stainless steel after a second cleaning with a vinegar solution.
The full report of this study could be found at the website for the Hospitality Institute of Technology and Management. Clicking on the graph below will also take you to the full HTML text of the report.
