Back in COVID I looked a into O3 (Ozone) based solutions that are highly effective as antibacterial/virus but come with a list of problems like you need to use the solutions within a few hours of generating them through electrolysis so you need to make your surface cleaning products on site and another problem is when aerosolized in sufficient quantity to be of use then the space is off limits for those few hours too. But if you can live within those conditions then O3 is a highly effective low cost low environmental impact solution.
And most metal will oxidize and most rubber will degrade, maybe suitable in operating rooms and similar where everything is inox steel, and that can be shut down enough to allow for the ozone come down to low enough concentration, but I don't think that ozone is viable in "normal" hospital rooms:
