I feel your pain. We have a large footpath right outside our door that people think is a parking space. This is despite the fact that it’s a footpath and there are double yellow lines on the road. The council have been utterly useless when approached.
I either accidently hit the vehicle with my bike whilst trying to get it in or out of the house. Works best if they are sat in the car at the time.
Sit on the bonnet as they’ve provided me with useful seating.
If, like last night, some utter cockwomble is sat with the engine running, music blaring, listening to the football, conducting a hands-free conversation (delete as applicable). I sneak around the side of my house come up from behind and bang on the window loudly.
The rotund fella listening to the football last night almost died of shock. When I calmly explained he was less than a foot from my house, directly under my kids bedroom he looked sheepish. I then asked him if he thought listening to the game whilst illegally parked that close to my house was reasonable. He muttered something and drove off.
I think you’ll find being reasonable doesn’t really work on people who do this sort of thing. Shock and shame or making a hash of getting around the badly parked vehicle are the way forward 😀