How do you get the original textures (colours, stickers, etc.) is you cover the car with powder ?
I tried many option, including scanning a very dirt car, using polarizing filter, etc, but never get satisfying results, especially on windows and windscreen.
A possible solution should be to use fixed cameras rack (30-50 simultaneous cameras placed in a converging circular pattern) and shoot 2 versions of the same car, one "clean" and one "powered". Of course, the position of the cameras must be strictly the same.
Another solution is perhaps to use a turning table, but I did not find a solution to assure the positional stability of (relative) camera position