We had a similar situation in Toronto. In our area the neighbourhoods are old and we only have street parking. In summer people are relaxed about parking spots, but in the winter, you tend to shovel the spot in front of your house and there’s an expectation you’ll park there.
A few years ago, we had a major snowstorm and my neighbour & I cleared our spots, Immediately after, my neighbour drove out to get diapers etc for his newborn. Within 2 minutes of him leaving, another neighbour from down the street pulled into the newly shovelled spot. The guy never shovelled the spot in front of his house and worse, he took the subway to work, meaning he left his car there for days at a time.
Similar to your neighbours, his attitude way “Fuck you, this is all public space, I can park anywhere I want.”
After two days (and another big snow dump) we got pissed off, so we boxed in his car with 3ft of snow on all sides and then we poured water all over the snow and turned it to solid ice.
We were very pleased with the job we did. Two other neighbours even came out and clapped as we did it.
That ended when he called the police the next day. My neighbour and I happened to be out shovelling again and the cop asked us if we knew what happened to the guys car. We told him the story, except we said we had no idea who’d done it. We said no one liked this guy, he was a dick who never shovelled and did this to everybody on the street (all true). Like an Agatha Christie novel - everyone is a suspect.
When the cop found out the guy never shovelled his own spot plus left his car sitting for days, all he said was “What an asshole.” He then told us that we should spread the word that if this sort of thing happened again, “whoever” did it had to make sure the snow or ice they shovelled did not physically touch any part of the guy’s car. Otherwise they could be charged if caught.
He then went back to the guy and chatted with him. Word got back to us that the cop told him he didn’t know who did it, but that he thought the guy was in the wrong and he could expect it to happen again and again unless he started to shovel his own spot He also said that if the ice wasn’t physically touching his car, not to waste the police time by calling them. It took him about 3 hours to literally pick-axe his car out but now he always shovels his own spot.
It sounds like you’re in southern California, so unfortunately this may not be a viable solution for you, but I thought I’d share it anyway. Sometimes there are happy endings.