Um, well, wrong but............
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That must be a bonanza for the city in winter months. Or do they just make you brush it off?
Here, where there are many dirt/gravel roads it isn't uncommon to see a vehicle so muddy the license plate is invisible. Never heard of anyone being stopped for that though.
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It is also -again in theory- illegal to drive with a blocked license plate in finland, be it snow, dirt or any kind of a plexiglass or other obstruction over the plate. Normally with a car or a bike you could get made to clean them up but sometimes when the cops raid trucks, and normally then for some reason they give you a ticket for just about anything, so yes I know of a few truckers that have gotten a slip for muddy/ snowy plates and/or tail lights.