Discuss as a team the factors that you will use to determine the level of cleanliness observed at each time interval before you get started.
3. Washer #1 should put a small amount (about a tablespoon) of washable paint on the palm of one hand and spread it evenly over both hands. Be sure to cover the backs of the hands and the skin next to and under the fingernails. Allow the paint to dry completely.
4. Go to the sink and blindfold Washer #1 so he or she can’t see his/her hands. Turn on warm (not scalding hot!) water.
Have Washer #1 wash with just water for one second. After one second, have the timekeeper blot dry the washer’s hands by very lightly touching the paper towel to the skin (do not rub!).
Use the scoring guide to record the cleanliness on the “water only” data table in the row marked “Washer #1.” Do not let Washer #1 see his/her hands, and be sure that you do not give away any hints about how clean they are.
5. Have the washer wash for four more seconds with just water. Again, lightly blot the washer’s hands and record their cleanliness in the data table.
6. Have the washer wash for 15 seconds more with water. Once again, blot and record the cleanliness on the data table.
7. Take the blindfold off and allow the washer to completely clean his/her hands.
8. Change roles and repeat steps 2 through 6 with Washer #2. Record these results on the second row of the data table, under “Washer #2.”
9. Now change roles again so that Washer #1 is back to the role of hand washer. Repeat steps 2 through 6, having the washer use soap each time. Record the results in the appropriate row of the data table.
10. It is now time for Washer #2 to repeat steps 2 through 6 using soap each time. Record these results in the second row of the data table.
