Covid isn't the only reason to disinfect surfaces. Proper disinfecting surfaces does prevent a large number of diseases. Covid we now know isn't one of them, but the others are still a worry.

Teachers have been using disinfecting wipes for decades, not just for COVID. Kids spread lots of germs.

When dealing with teachers understand that when presented with a career choice they are the folks who self selected into the job with summers off and the easiest course load. They will use the smallest excuse not to have to show up for work.