Don't get stuck on being unique. It's more important to get started than to get caught on differentiating yourself. Differentiate as you go.
I also wouldn't get too focused on the wrapping yet. Car detailing is a great idea to get started. Start that TOMORROW and then reassess in 6 months. With some experience and customers it will be much more clear what the best next step is.
I don't think all the great ideas are taken. However I also don't think it's usually worth people's time to try and think of something brand new.
So often the best businesses are ones that already exist. Start something and do it better. The main part of being an entrepreneur in my opinion is just starting.
I feel like Door Dash is "successful" in that it's a household name but they still aren't a profitable company
Debian > Ubuntu
There's a LOT between wanting to do nothing and "being a slave till 70"