How would I restore this or clean it?

It's a vintage weather station. Barometer,hygrometer, and thermometer. The bottom right gives instructions how to read each one. Sanding the rust off would clean it up, but you would lose the text on the bottom right. Spray painting with metal paint. Tape off what you don't want painted. The brass around the round bezels can aslo be spray painted. If there is a brand or makers mark you can research that. You may find a photo of how it oroginaly looked.

Good Question, First,what kind of metal is it, second can the Instruments be removed?,third can you provide a Pic of the back?

Is it brass? If so, brasso would be my go to.

This is an antique weather forecaster with a thermometer and barometer from the old days. The rustic look it has should remain as is. Your thermometer is in Fahrenheit and Celsius. You also have a barometer (air pressure) and hygrometer (amount of water in the air). These also predict forthcoming weather changes. They were very popular before Doppler radar, weather satellites, etc. And yes! I am that old! You should really keep it in its current condition. It is more of a conversation piece today. You can google this and get more information on this piece of history.

I need a drool bib...this is gorgeous, just as is.

Good answer from Cor32419347. At the very least, do some research to assess it's current value before doing permanent damage. So many antiques are ruined when the patina is removed by "restoration".

If it has value, follow expert advise on restoring (we're just DIYers)

If there is no value please consider giving or selling it to someone who appreciates it as is. In that case, if it were mine, I might try to stabilize the rust with a matte finish polyurethane. But... it's yours and if you want shiny and bright that is your right. (sigh)

I agree with Cor and Kc. It should be left as is.