Hello,
I have Fiat 500 with a lovely cream interior. There is a pen mark on the steering wheel, a black biro pen, and I was wondering if anyone knows if there's something I could use to remove this without damaging the white covering on the wheel?
Also,
I have what seems to be an oil mark on the body of the car, exterior. is there something I could use to remove this?
Many thanks!

Take a look here, woodensteeringwheels these guys really do know how it's done. Try to contact them, I think they might help.

You can really only try leather cleaners and keep having a go at it, the leather on fiat steering wheels is very thin so be careful with it. The only option if you can’t get it out maybe to have it recovered, which is going to be costly so it depends what you can live with