Toxic Teacher?

I was educated that some cleansing subatances were harmful to the lungs of little children, not necessarily adults, though. So when our first-grade teacher started to clean the windows, I started to panick, not a good thing. "Everyone hold your breath! The cleanser is bad for your lungs!" I practically shouted. Cheeks were puffed up and faces turned red everywhere around me.
Then my teacher explained that she was using water.
Oh. Sorry about that!