You have two basic ways. Keep the machine warm or keep it treated.

The machine gets rust due to condensation, which of course occurs when the machine is colder than the dew point. Often what happens is the machine is at whatever the temperature of the building is, then warm moist air moves in and this creates condensation leading to rust. I'm guessing the ways are not mostly over a cabinet or enclosure you can put a light bulb in for warmth.

What I use for prevention is called Rust Check, which is from a Canadian automobile rust protection company of the same name. They sell a spray can of a light oil based chemical treatment which is good for about a year. Spray it on, you can leave it or wipe it off the next day. You can get a liter bottle from them as well. I expect there are similar treatments available where you are, but if not, try LPS3 - I believe it's a similar concept of an oil based chemical treatment and it seems to have a pretty good reputation.

Wayne