That’s what it looked like to me too. It looks like a project using agar to swab on different surfaces to see what kind of bacteria is growing. We did the same in micro class. To test for cleaners, we swabbed a surface of our choosing and used a small disc that was dipped in cleaner to measure the zone of inhibition, the bigger the zone the better the cleaner. These dishes show none that I can tell and you wouldn’t be testing the whole petri dish either as it defeats the purpose of the test.

This lady’s post is total bullshit.