For the record, operating rooms are far from sterile, it’s more like they are just really clean. They lack a lot of the controls and mechanisms in place to maintain a truly sterile space (also humans are your biggest source of contaminants in any kind of cleanroom). If you want to look at spaces that are maintained to be truly sterile, you would want to look at Grade A GMP Cleanrooms. I work in pharmaceutical manufacturing, and things like vials and syringes need to be filled in a Grade A space to ensure it is sterile before it is opened by the patient/clinic.

There are a range of classifications of clean areas, and the Grade A space is usually just within a sealed chamber inside a lower class room. Specifically, usually the Grade A space is inside a piece of equipment called an Isolator (picture here). The way that materials and supplies move in and out of the isolator is very well controlled. As an example, something might be packaged with multiple layers of packaging and each layer is shed as it moves from one Grade of cleanliness to another through a specific port. For liquids, they are passed through a sterilizing filter before being allowed into the Grade A space. To sterilize the interior, the interior of the isolator is inundated with vaporized hydrogen peroxide for a set amount of time and flow rate (it depends on the specific geometry of the isolator, these are usually custom builds).

If you are interested in sanitizing your dishware (not sterilizing, that is different), then a much cheaper method would be to use a sanitizing cleaner like Star San. Just spray it on your dishes, let it sit a minute or so and your dish is now sanitized (though it is now wet).

How the hell did you get from Umamusume to autoclaves? :p