I've seen the rust like that in Ontario... (Here salting the roads is cheeper than plowing the roads ) It looks very dry & unprotected. Spray the axles ( why not the whole car ) with the Krown rust proof spray. It will seep into seams & material & stop this. You do have to apply it regularly, but it will stop it. Do not use a wax or grease based undercoat as it only covers parts & does not creep into places. If it doesn't drip on your driveway or creep from the doors, it"s the wrong stuff... Try it!!!
Roger
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View my fuel log 2018 Mirage GT 1.2 automatic: 37.3 mpg (US) ... 15.9 km/L ... 6.3 L/100 km ... 44.8 mpg (Imp)