In Sweden washing a car at home is discouraged and depending on how you read the law can be illegal (it is not illegal per se to wash a car at home, but it is illegal to to let out untreated water into nature - and since waste water from car washing is not untreated and probably contains oil and metals, it is most likely illegal on this provision).
Enforcement is on a council-by-council basis, but of course in urban areas I imagine this is pretty hard to enforce. In rural settings it must be pretty much impossible. Having said that, I haven't really seen many people at all washing their car at home. Maybe it depends where you live, if you have neighbours who do it a lot it probably feels like everyone does it.
In the last few years, there have been a load of "wash your own car" car wash stations opening up. They're cheap (you can do the car for <100kr - $10 or so), way less than the drive in station, and have things you wouldn't have at home (e.g. cleaning underneath the car, handy for washing off the salt that has come off the road in winter). Not really enforcement but a pretty effective way of nudging people to doing the "right thing".
Enforcement is on a council-by-council basis, but of course in urban areas I imagine this is pretty hard to enforce. In rural settings it must be pretty much impossible. Having said that, I haven't really seen many people at all washing their car at home. Maybe it depends where you live, if you have neighbours who do it a lot it probably feels like everyone does it.
In the last few years, there have been a load of "wash your own car" car wash stations opening up. They're cheap (you can do the car for <100kr - $10 or so), way less than the drive in station, and have things you wouldn't have at home (e.g. cleaning underneath the car, handy for washing off the salt that has come off the road in winter). Not really enforcement but a pretty effective way of nudging people to doing the "right thing".