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Question on science experiment with bacteria

Can you do a science experiment on hand sanitizer killing bacteria that has already been grown in a Petri dish? I swabbed 6 different everyday items and grew the bacteria in a Petri dish. So know I am wondering if I can put hand sanitizer in each one and see if it kills the bacteria.
 
I am still confused. Couldn' I just open the Petri dishes I have used to grow bacteria in and drop a measured amount of hand sanitizer of the same brand into the Petri dishes re-tape the dishes and abserve?

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J.R. S. | Ph.D. in Biochemistry--University Professor--Chemistry TutorPh.D. in Biochemistry--University Profes...
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Sure.  You can do that.  Of course, to do it properly, you'll need a well-designed experimental approach, including proper controls, and awareness of other variables.  If you want additional advice, post again asking specific questions.

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I am still confused. Couldn' I just open the Petri dishes I have used to grow bacteria in and drop a measured amount of hand sanitizer of the same brand into the Petri dishes re-tape the dishes and abserve?
Yes, you can do that, but then the question would be "what would have happened to the bacteria in those same petri dishes if you had just opened them and then closed them again.  If you see an effect of the added sanitizer, you can't be sure it was actually due to the sanitizer or to some other "variable" that you don't know about. Also, if you see an effect of the sanitizer, is it the chemicals in the sanitizer or the alcohol, or water that those chemicals are dissolved in? That's what I meant by controls and variables.  I suppose if you are in an early grade in school then doing what you propose would be ok.  But it isn't "scientifically" sound.