Diffusion of responsibility is a fact of human nature, unfortunately – specifically, ‘social loafing’.
I doubt anyone inducted on the laser cutter is unaware that it needs constant cleaning, or that they should clean it after they use it. Some people just listen to the little voice in the back of their head that says “I can leave the mess, just this once. The next person to use it will clean up after themselves, and that will catch my mess too.” We all have the voice to some extent, but some people are lazy enough to listen.
Reminder signage and/or little visual guides of how to properly clean the machine would probably help a bit, and perhaps some social norm trickery (i.e. “re-use your towel to save water and the environment!” vs “90% of our guests at this hotel re-use their towels.”)
Ultimately though I think for cleanliness and maintenance issues like this, if there’s already a method that allows the previous messy user to be identified – i.e. the fob log – then we already have the best tool. Direct consequence is the most effective method for long term compliance.