That seems not done right, then.

A hot desk is a communal space, just like a breakroom table. The space needs to be obviously built to be shared, part of the cleaners' rotation (an added cost, yes, but perhaps less the 4x desks, and the built setup matters. Design for cleaning.)

I'll say that I've worked remotely for 4 years, but I do occasionally (monthly?) use a hot desk at my HQ. They are clearly designed and treated as communal spaces, and I haven't had a problem as a result.