How to file self-service car vacuums?

Hey, new here. There’s a convenience store in my town with a self-service vacuum for vehicles ($1.50 for a few minutes of use). These aren’t that common, so I’d like to add this info to OpenStreetMap, but I’m not sure where to start. The device is physically separated from the store, and it’s not part of a larger car wash operation. Any advice on how to categorize/add this would be appreciated.

amenity=vacuum_cleaner would do it.

Don’t know how I missed that. Thanks.