Whoever is doing it, please stop. You are rusting the cast iron finishes that we work hard to keep polished and smooth. And once the surface rusts, the next person to use the tool will not be able to slide their wood easily on the cast iron, which can create a safety hazard as they have to push harder to get their board through the cutter. (Note: Talcum powder is not the solution.)
Your wood is the only thing that should be touching the cast iron anyway, not your fingers or hands. You can spray the disinfectant on a rag and wipe down the knobs and switches that you touch, but please do not spray disinfectant on the cast iron, and don’t wipe down the cast iron with anything water based. Clean up with a brush when done.
This surface was a mirror a few days ago.